diff --git a/staff/agustin-birman/api/handlers/index.js b/staff/agustin-birman/api/handlers/index.js
index 053a8b561..7288082a0 100644
--- a/staff/agustin-birman/api/handlers/index.js
+++ b/staff/agustin-birman/api/handlers/index.js
@@ -15,8 +15,7 @@ import getExercisesHandler from './getExercisesHandler.js'
 import deleteExerciseHandler from './deleteExerciseHandler.js'
 import editExerciseHandler from './editExerciseHandler.js'
 
-import submitAnswer from '../logic/submitAnswer.js'
-
+import submitAnswerHandler from './submitAnswerHandler.js'
 export {
     registerUserHandler,
     authenticateUserHandler,
@@ -35,5 +34,5 @@ export {
     deleteExerciseHandler,
     editExerciseHandler,
 
-    submitAnswer
+    submitAnswerHandler
 }
\ No newline at end of file
diff --git a/staff/agustin-birman/api/handlers/submitAnswerHandler.js b/staff/agustin-birman/api/handlers/submitAnswerHandler.js
index 0b27e63b5..5963191ac 100644
--- a/staff/agustin-birman/api/handlers/submitAnswerHandler.js
+++ b/staff/agustin-birman/api/handlers/submitAnswerHandler.js
@@ -1,21 +1,30 @@
-import logic from '../logic/index.js'
 import jwt from '../util/jsonwebtoken-promised.js'
 
+import logic from '../logic/index.js'
+
+import { CredentialsError } from 'com/errors.js'
+
 const { JWT_SECRET } = process.env
 
 export default (req, res, next) => {
     try {
         const token = req.headers.authorization.slice(7)
 
-        const { exerciseId, answer } = req.body
         jwt.verify(token, JWT_SECRET)
-        try {
-            logic.submitAnswer(userId, exerciseId, answer)
-                .then(() => res.status(201).json())
-                .catch(error => next(error))
-        } catch (error) {
-            next(error)
-        }
+            .then(payload => {
+                const { sub: userId } = payload
+
+                const { exerciseId, answer } = req.body
+
+                try {
+                    logic.submitAnswer(userId, exerciseId, answer)
+                        .then(() => res.status(201).json())
+                        .catch(error => next(error))
+                } catch (error) {
+                    next(error)
+                }
+            })
+            .catch(error => next(new CredentialsError(error.message)))
     } catch (error) {
         next(error)
     }
diff --git a/staff/agustin-birman/api/index.js b/staff/agustin-birman/api/index.js
index ac032636f..c10f36ffe 100644
--- a/staff/agustin-birman/api/index.js
+++ b/staff/agustin-birman/api/index.js
@@ -17,7 +17,8 @@ import {
     deleteExerciseHandler,
     editActivityHandler,
     editExerciseHandler,
-    submitAnswer
+
+    submitAnswerHandler
 } from './handlers/index.js'
 
 const { MONGODB_URL, PORT } = process.env
@@ -61,7 +62,7 @@ mongoose.connect(MONGODB_URL)
 
         api.patch('/exercise/:exerciseId', jsonBodyParser, editExerciseHandler)
 
-        api.post('/answer', jsonBodyParser, submitAnswer)
+        api.post('/answer', jsonBodyParser, submitAnswerHandler)
 
         api.use(errorHandler)
 
diff --git a/staff/agustin-birman/app/src/components/core/Button/index.jsx b/staff/agustin-birman/app/src/components/core/Button/index.jsx
index ccc55d06c..e4afd7988 100644
--- a/staff/agustin-birman/app/src/components/core/Button/index.jsx
+++ b/staff/agustin-birman/app/src/components/core/Button/index.jsx
@@ -1,7 +1,7 @@
 import './index.css'
 
-function Button({ type, className, onClick, children }) {
-    return <button className={`Button ${className ? className : ''}`} type={type} onClick={onClick}>{children}</button>
+function Button({ type, className, onClick, children, disabled }) {
+    return <button className={`Button ${className ? className : ''}`} type={type} onClick={onClick} disabled={disabled}>{children} </button>
 }
 
 export default Button
\ No newline at end of file
diff --git a/staff/agustin-birman/app/src/components/core/Input/index.jsx b/staff/agustin-birman/app/src/components/core/Input/index.jsx
index 6230ad46a..a02663402 100644
--- a/staff/agustin-birman/app/src/components/core/Input/index.jsx
+++ b/staff/agustin-birman/app/src/components/core/Input/index.jsx
@@ -1,7 +1,16 @@
 import './index.css'
 
-function Input({ id, type, name, placeholder, value, checked, onChange }) {
-    return <input className='Input' id={id} type={type} name={name} placeholder={placeholder} value={value} checked={checked} onChange={onChange} />
+function Input({ id, type, name, placeholder, value, checked, onChange, className, required }) {
+    return <input
+        className={`Input ${className ? className : ''}`}
+        id={id}
+        type={type}
+        name={name}
+        placeholder={placeholder}
+        value={value}
+        checked={checked}
+        onChange={onChange}
+        required={required} />
 }
 
 export default Input
\ No newline at end of file
diff --git a/staff/agustin-birman/app/src/logic/index.js b/staff/agustin-birman/app/src/logic/index.js
index 48c8ab68d..b7bdd2339 100644
--- a/staff/agustin-birman/app/src/logic/index.js
+++ b/staff/agustin-birman/app/src/logic/index.js
@@ -12,6 +12,7 @@ import editActivity from './editActivity'
 import getExercises from './getExercises'
 import deleteExercise from './deleteExercise'
 import editExercise from './editExercise'
+import submitAnswer from './submitAnswer'
 
 const logic = {
     registerUser,
@@ -27,7 +28,8 @@ const logic = {
     editActivity,
     getExercises,
     deleteExercise,
-    editExercise
+    editExercise,
+    submitAnswer
 }
 
 export default logic
\ No newline at end of file
diff --git a/staff/agustin-birman/app/src/logic/submitAnswer.js b/staff/agustin-birman/app/src/logic/submitAnswer.js
new file mode 100644
index 000000000..1c761c9ce
--- /dev/null
+++ b/staff/agustin-birman/app/src/logic/submitAnswer.js
@@ -0,0 +1,32 @@
+import errors, { SystemError } from "com/errors"
+import validate from "com/validate"
+
+const submitAnswer = (exerciseId, answer) => {
+    validate.id(exerciseId, 'exerciseId')
+    validate.text(answer, 'answer')
+
+    return fetch(`${import.meta.env.VITE_API_URL}/answer`, {
+        method: 'POST',
+        headers: {
+            Authorization: `Bearer ${sessionStorage.token}`,
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({ exerciseId, answer })
+    })
+        .catch(() => { throw new SystemError('server error') })
+        .then(response => {
+            if (response.status === 201)
+                return
+
+            return response.json()
+                .catch(() => { throw new SystemError('server error') })
+                .then(body => {
+                    const { error, message } = body
+
+                    const constructor = errors[error]
+
+                    throw new constructor(message)
+                })
+        })
+}
+export default submitAnswer
diff --git a/staff/agustin-birman/app/src/views/components/DoActivity/index.css b/staff/agustin-birman/app/src/views/components/DoActivity/index.css
new file mode 100644
index 000000000..213c8ff40
--- /dev/null
+++ b/staff/agustin-birman/app/src/views/components/DoActivity/index.css
@@ -0,0 +1,9 @@
+.ExerciseContainer{
+    display:inline-flex;
+    align-items: center;
+    white-space: nowrap;
+}
+
+.ExerciseInput{
+    width: 6rem;
+}
\ No newline at end of file
diff --git a/staff/agustin-birman/app/src/views/components/DoActivity/index.jsx b/staff/agustin-birman/app/src/views/components/DoActivity/index.jsx
index a2d9aaddb..f605c7e46 100644
--- a/staff/agustin-birman/app/src/views/components/DoActivity/index.jsx
+++ b/staff/agustin-birman/app/src/views/components/DoActivity/index.jsx
@@ -1,21 +1,33 @@
-import { useParams } from 'react-router-dom';
+import { useNavigate, useParams } from 'react-router-dom';
 import View from '../../../components/library/View';
 import { useEffect, useState } from 'react';
 import Heading from '../../../components/core/Heading';
 import Text from '../../../components/core/Text';
 import logic from '../../../logic';
 import Input from '../../../components/core/Input';
+import Button from '../../../components/core/Button';
+import './index.css'
 
 let SENTENCE_REGEX = /^(.*?)\s*\(.*?\)\s*(.*?)$/
 
 function DoActivity() {
     const [exercises, setExercises] = useState([])
+    const [answer, setAnswer] = useState('')
+    const [currentPage, setCurrentPage] = useState(1)
+    const pageSize = 1
     const { activityId } = useParams()
+    const navigate = useNavigate()
+
+    const isLastPage = currentPage === Math.ceil(exercises.length / pageSize)
 
     useEffect(() => {
         loadExercises()
     }, [])
 
+    useEffect(() => {
+        setAnswer('')
+    }, [currentPage])
+
     const loadExercises = () => {
         try {
             logic.getExercises(activityId)
@@ -32,13 +44,37 @@ function DoActivity() {
         }
     }
 
-    const handleSubmittedAnswer = () => {
-        //TODO
+    const handleSubmittedAnswer = (exerciseId) => {
+        try {
+            logic.submitAnswer(exerciseId, answer)
+                .then(() => {
+                    handleChangePage(currentPage + 1)
+
+                    if (isLastPage)
+                        navigate('/')
+                })
+                .catch(error => {
+                    console.error(error)
+
+                    alert(error.message) //TODO hacer un alert mejor
+                })
+        } catch (error) {
+            console.error(error)
+
+            alert(error.message)
+        }
+    }
+
+    const handleChangePage = newPage => {
+        setCurrentPage(newPage)
     }
 
+    const currentExercises = exercises.slice((currentPage - 1) * pageSize, currentPage * pageSize);
+
+
     return (<View>
         <Heading level='2'></Heading>
-        {exercises.map(exercise => {
+        {currentExercises.map(exercise => {
             let beforeParentheses = ''
             let afterParentheses = ''
 
@@ -51,12 +87,23 @@ function DoActivity() {
 
             return (<View key={exercise.index}>
                 <Text>{exercise.index + 1} Exercise</Text>
-                <Text>{beforeParentheses}</Text>
-                <Input />
-                <Text>{afterParentheses}</Text>
+                <div className='ExerciseContainer'>
+                    <Text>{beforeParentheses}</Text>
+                    <Input className='ExerciseInput' onChange={(e) => { setAnswer(e.target.value) }} />
+                    <Text>{afterParentheses}</Text>
+                </div>
+
+                {isLastPage === false
+                    ? <Button onClick={() => handleSubmittedAnswer(exercise._id)}>Next Exercise</Button>
+                    : <Button onClick={() => handleSubmittedAnswer(exercise._id)}>Finish</Button>}
+
+                <Text>Page {currentPage} of {Math.ceil(exercises.length / pageSize)}</Text>
             </View>)
-        }
-        )}
+        })}
+        {/* <div className='PaginationControls'>
+            <Button onClick={() => handleChangePage(currentPage - 1)} disabled={currentPage === 1}>Previous</Button>
+            <Button onClick={() => handleChangePage(currentPage + 1)} disabled={currentPage === Math.ceil(exercises.length / pageSize)}>Next</Button>
+        </div> */}
     </View >
     )
 }