1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ivanshal [37]
3 years ago
8

1. Ellen said she spent half her money for lunch and half of what was left for a movie. She now has $1.20. How much did she spen

d for lunch?
Mathematics
1 answer:
krok68 [10]3 years ago
8 0

Answer:

Ellen spent $2.40 on her lunch.

Step-by-step explanation:

Let,

x be the total amount Ellen had.

Amount spent on lunch = \frac{x}{2}

Amount left after lunch = x-\frac{x}{2}=\frac{2x-x}{2}=\frac{x}{2}

Amount spent on movie = \frac{1}{2}*\frac{x}{2}=\frac{x}{4}\\

Amount she has left = $1.20

Total amount = Lunch amount + Movie amount + Amount left

x = \frac{x}{2}+\frac{x}{4}+1.20

x = \frac{2x+x+4.80}{4}\\4x=3x+4.80\\x = 4.80

Amount spent on lunch = \frac{4.80}{2} = $2.40

Hence,

Ellen spent $2.40 on her lunch.

You might be interested in
you own seven travel books and are taking five of them on vacation. in how many ways can you select the five books you will take
Ipatiy [6.2K]
It depends on how many options you have
You multiply the total number of books you have time 5 because you can choose 5
8 0
3 years ago
Which function is linear?
gulaghasi [49]

Answer:

4

Step-by-step explanation:

5-1=4

4 0
3 years ago
What is the area of the triangle?
Dovator [93]
Area = bh/2
(9.9 x 5.5)÷2 = 27.225 ft^2
3 0
3 years ago
Read 2 more answers
Area and perimeter of composite figures​
nydimaria [60]
Area is 92.13 and the perimeter is 47.42 i think it’s correct
6 0
2 years ago
What is the quadratic regression equation for the data set? ​ ​ ​ <br><br> PLEASEE HELP ME
Soloha48 [4]
You're trying to find constants a_0,a_1,a_2 such that \hat y=a_0+a_1\hat x+a_2{\hat x}^2. Equivalently, you're looking for the least-square solution to the following matrix equation.


\underbrace{\begin{bmatrix}1&6&6^2\\1&3&3^2\\\vdots&\vdots&\vdots\\1&9&9^2\end{bmatrix}}_{\mathbf A}\underbrace{\begin{bmatrix}a_0\\a_1\\a_2\end{bmatrix}}_{\mathbf x}=\underbrace{\begin{bmatrix}100\\110\\\vdots\\70\end{bmatrix}}_{\mathbf b}

To solve \mathbf{Ax}=\mathbf b, multiply both sides by the transpose of \mathbf A, which introduces an invertible square matrix on the LHS.

\mathbf{Ax}=\mathbf b\implies\mathbf A^\top\mathbf{Ax}=\mathbf A^\top\mathbf b\implies\mathbf x=(\mathbf A^\top\mathbf A)^{-1}\mathbf A^\top\mathbf b

Computing this, you'd find that

\mathbf x=\begin{bmatrix}a_0\\a_1\\a_2\end{bmatrix}\approx\begin{bmatrix}121.119\\-3.786\\-0.175\end{bmatrix}

which means the first choice is correct.
8 0
3 years ago
Other questions:
  • A die is rolled twice.What is the probability the next roll is an even?
    15·1 answer
  • Kendra was asked to find the number of students who planned to attend the evening symphony performance. She was told that 40 per
    15·1 answer
  • 10 POINTS AND BRAINLIEST! QUESTIONS IN PICTURES
    13·1 answer
  • EASY POINTS<br> PLEASE ANSWER<br> :)<br><br> LOTS OF POINTS!!!!!!!!!!!!!!!!!!!!!!
    7·1 answer
  • Wrong amount of points so here’s the actual amount :^
    5·2 answers
  • Decide whether there is enough information given in the picture to prove that the
    11·1 answer
  • Answer fast ..................​
    12·1 answer
  • Corey and Margaret went scuba diving in the ocean together. Corey dove to a depth of -23 feet, while Margaret dove to a depth of
    7·1 answer
  • Of the25 players on a baseball team,12 are pitchers.What percent of the players are pitchers
    12·1 answer
  • noah does half as many push-ups as joseph. joshua does 3 times as many push-ups as joseph. they complete 324 altogether. How man
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!