166
A=2(wl+hl+hw)=2·(4·5+7·5+7·4)=166
C
YOUR ANSWER IS C BECAUSE ITS EQULVILENT
Multiply both sides by 3
Simplify the numerators
Multiply both sides by 6
Simplify the numerator
Multiply both sides by x
12x - 18 = 15x Subtract 12x from both sides
-18 = 3x Divide both sides by 3
-6 = x Switch the sides to make it easier to read
x = -6
Check your answer by plugging -6 in for the x in the original problem:
Plug in -6 for x
Change
to
so all denominators are the same
Change
to
for easier work
Subtract the numerators (4 - (-1) )
=
So,
x = -6 .
19.q 20.d 21.6/7 22.6/7 23.b
(-27-19=-2x) then you add then you get (-46=-2x) divide by -2 you get 23
so x=23