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Sever21 [200]
2 years ago
6

!!help!! pls :((( im so confused pls help

Mathematics
2 answers:
Andrej [43]2 years ago
7 0

I only know the first one with the method Emmanuel is doing sorry ;(

at least there's a guide in this image

SVEN [57.7K]2 years ago
5 0

Step-by-step explanation:

for some reason the equation at the top says 7(x+2) but both of the equations at the bottom say 7(x-2)... I'm just going to do 7(x-2)

Emmanuels Work:

7(x-2)=91

distribute the 7 by multiplying both x and -2 by it

7x-14=91

add 14 to both sides

7x=105

divide both sides by 7

x=15

Mauricio's Work:

7(x-2)=91

to get rid of the 7 multiplication, divide both sides by 7

x-2=13

add 2 to both sides

x=15

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3 years ago
Given the functions f(x) = 3x and g(x) = x² + 1, find [(gºf)(x)]- [(fºg)(x)].
Ipatiy [6.2K]

Answer:

6x^2 - 2

Step-by-step explanation:

plug in f(x) into the g(x) formula given

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simplify

= 9x^2+2

plug in g(x) into the f(x) formula given

f(g(x)) = 3(x^2+1)

distribute

= 3x^2 +3

set g(f(x)) - f(g(x))

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carry the negative

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7 0
3 years ago
The perimeter of the triangle shown to the right is 143 meters. Find the length of each side.
snow_lady [41]

Hello!

First:

write an equation.

5x + (7x+8) + (7x+2) = 143

now combine like terms

19x + 10 =143

now subtract 10 from both sides

19x = 133

divide 19 on both sides.

x = 7.

Are you done here? Nope, we need to find out what each side is, so lets plug in the number 7 for x.

-----------------------------

For the side 5(x)

5(7) = 35

This side is 35m

-----------------------

For the side 7x + 2

7(7) + 2

49 + 2

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This side is 51m

------------------------

For the side 7x + 8

7(7) + 8

49 + 8

57

This side is 57m.

------------------------

I hope this helps,

Have a great day!

4 0
2 years ago
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