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
Rudiy27
3 years ago
13

In Chad's reading class, all the students are reading the same book. The school bought each student a book at $7 per book. If th

ere are 27 students in Chad's class, which of the following expressions could not be used to calculate the total cost?
a. 7(30) - 7(7)
b. 7(20) + 7(7)
c. 7(30) - 7(3)
Mathematics
2 answers:
Molodets [167]3 years ago
8 0

It would be A. 7(30) - 7(7)


natka813 [3]3 years ago
5 0

Answer:

a. 7(30) - 7(7)

Step-by-step explanation:

Given,

The total number of students = 27,

∵ Every student gets a book of $ 7,

So, the total cost ( in dollars ) = price of each book × total student  

= 7 × 27

= 7(27)

∵ 7(30) - 7(7) = 7(30-7) = 7(23) ≠ 7(27)

7(20) + 7(7) = 7(20+7) = 7(27)

7(30) - 7(3) = 7(30-3) = 7(27)

Hence, option 'a' is correct.

You might be interested in
A formal power series over R is a formal infinite sum f = X[infinity] n=0 anxn, where the coefficients an ∈ R. We add power seri
Ksivusya [100]

Answer:

Check the explanation

Step-by-step explanation:

where the letter D is the diagonal matrix with diagonal entries λ1,…,λn. Now let's assume V is invertible, that is,  this particular given eigenvectors are linearly independent, you get M=VDV−1.

Kindly check the attached image below to see the step by step explanation to the question above.

5 0
3 years ago
Select all the statements that correctly describe the solutions to this system of equations?
Luba_88 [7]

x + y = 9

x = 9 - y

2x - y = 0

2(9 - y) - y = 0

18 - 2y - y = 0

-3y = -18

y = 6

x = 9 - y

x = 9 - 6

x = 3

5 0
3 years ago
State what additional information is required in order to know that the triangles are congruent by AAS. part 2
SVEN [57.7K]

Answer:

Step-by-step explanation:

The trick is to find the third angle

180 - A - <BCA = <CBA

180 - X - <BCX = <CBX

Everything else is OK

<CBA = <CBX                  Equals equated to an equal express = an equal expression.

Now by a little slight of hand, you get the two triangles to be equal by ASA, which always works.

Cheating you say? There is no such thing as cheating if it correct and it works.

8 0
3 years ago
What is the total amount that Mathews bank will receive after lending him 8000 for four years
marysya [2.9K]

Answer:

32,000

Step-by-step explanation:

5 0
3 years ago
Is y=3x-5 and 6x=2y+10 a solution
iVinArrow [24]
Y=3x-5
y-3x=-5
Times 2 from both side
y(2)-3x(2)=-5(2)
2y-6x=-10
Times negative from both side
(-)2y-6x(-)=(-)-10
-2y+6x=10
or
6x-2y=10


6x=2y+10
6x-2y=10
Furthermore, we see that both equation have the same 6x-2y=10 which means that both of them have infinity solutions, not a solution. Hope it help!
5 0
3 years ago
Other questions:
  • Which of the following describes the correct process for solving the equation 3x + 6 = 21 and arrives at the correct solution?
    15·1 answer
  • Identify the equation of the parent function, y=x3, that is horizontally stretched by a factor of 1/5 and reflected over the y-a
    12·2 answers
  • PLEASE HELP A flight across the US takes longer east to west then it does west to east. This is due to the plane having a headwi
    15·1 answer
  • 800,000+6,000+300+2 word form
    8·2 answers
  • Which of the following is a quadratic function?
    5·1 answer
  • How to answer this question, please I need steps​
    5·1 answer
  • The supplementary angle to 69 degrees would be considered ?
    5·1 answer
  • Identify the corresponding word problem giving the equation: x-6.2=18.8​
    15·2 answers
  • Help help math math math please
    12·1 answer
  • The Tropical Bay Resort complex is building a new irrigation system to ensure proper watering of their luscious landscape. Assum
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!