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Q: -9 equals 20 plus r

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-9r = 20 + rsubtract r from both sides-10r = 20divide both sides by -10r = -2

-9

r2 + r - 20 = 0(r + 5)(r - 4) = 0r + 5 = 0 or r - 4 = 0r = -5 or r = 4

This is the associative law for addition: If a, b, c are any numbers then: a + (b + c) = (a + b) + c

It's an incorrect statement. 5 plus 6 equals plus 11. Also, pi R round, cornbread R2 .

It is a linear equation in the variable r.

12r + 4 = 112, 12r = 108, r = 9

3r-r equals 12 = -9

It is 22 + R

v

-8

r+5r+5=-25

r=2

24

r + 11 + 8r = 29

-13

25

It is an equation and the value of r is 66

r=8

|2r + 9| = 5 So 2r + 9 = 5 or 2r + 9 = -5 so that 2r = -4 or 2r = -14 r = -2 or r = -7

36v

Surface Area = pi*r*s + pi*r*r = 3.14*2*9 + 3.14*2*2

15 and 24, respectively.

-9

y / r2 = a constant (k) so k = 405/81 ie 5. k = y/4 when r = 2, so y = 20.