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FrozenT [24]
2 years ago
11

What value of x makes this equation true? 15-7x=5x-21​

Mathematics
1 answer:
belka [17]2 years ago
4 0

Answer:

x=3

Step-by-step explanation:

15-7x=5x-21

12x=36

x=3

You might be interested in
If y = 12 when x = 6, determine y when x = 18 write an equation
Aleksandr [31]
If y=12 when x=6, then y=36 when x=18 by the equation y=2x.
4 0
3 years ago
A, b, and c are polynomials, where a = n, b = 2n 6, and c = n2 – 1. what is ab – c in simplest form? –n2 3n 5 n2 6n 1 2n2 6n – 1
Elena L [17]

The equations a = n, b = 2n + 6 and c = n² - 1 are polynomials, and the expression for ab - c is n² + 6n + 1

<h3>How to determine the expression for ab - c?</h3>

The polynomials are given as:

a = n

b = 2n + 6

c = n² - 1

The expression ab - c is calculated using:

ab - c = n * (2n + 6) - (n² - 1)

Expand

ab - c = 2n² + 6n - n² + 1

Collect like terms

ab - c = 2n² - n² + 6n  + 1

Evaluate

ab - c = n² + 6n + 1

Hence, the expression for ab - c is n² + 6n + 1

Read more about polynomials at:

brainly.com/question/4142886

#SPJ4

8 0
2 years ago
a package of 8 rechargeable batteries cost 12. at the rate how much would 20 rechargeable batteries would cost
Anettt [7]

Step-by-step explanation:

8 battery =12

20 battery =?(x)

8x=240

x=240÷8

x=30

for 20 battery..it would cost 30

5 0
3 years ago
Find a solution to the linear equation y equals 8x-32
Lerok [7]

Answer:

(4, 0).

Step-by-step explanation:

y = 8x - 32

There are many solutions that we can choose from, since any set of coordinates that fit in the equation counts as a solution.

We can have (0, -32), (1, -24), (2, -16), (3, -8), (4, 0), and many more.

Hope this helps!

4 0
3 years ago
Read 2 more answers
Could someone explain how you would solve this? I really don't understand it.
nlexa [21]
Because of rules of geometry we know that a+b=180 degrees so we can add the equations together and set that equal to 180 and solve
6x-48+4x+38=180
subtract 38 from both sides and add 48 to both sides
then add like terms
10x=170
and divide by 10 to get 
x=17
7 0
3 years ago
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