7x + 7y = -21 also 48x -8y= 136 using the substitution method to find x and y

7x + 7y = -21

48x - 8y = 136            This is where you find a common sum.

8(7x + 7y = -21)             ex: 7 and 8

7(48x - 8y = 136)

56x + 56y = -168         Multiply it out

336x -56y = 952

392x = 784                  Divide/Simplify

x = 2

Now substitute to find Y. I hope this helped!

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine