Evaluating expressions

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Step-by-step explanation:

12  .x=3                y= -3

-x+2(y-1)

=-3+2(-3-1) = -3 -6 -2 = -9 -2 = -11

13.a=3

-5(a^2) -a + 5

=-5(3^2) -3 + 5  =  -5(9) +2  = -45 +2 =-43

14.  a = -2             b=4

-4a +3(2b-1)

= -4(-2)  +3( 2(4)-1 ) =8 +3(8-1)  = 8 +3(7) = 8 +21 =29

15. x = -2

3x^2 - 4x +1  =3(-2^2) -4(-2) +1 =  3(4) -4(-2) + 1 = 12 +8 +1 =20 +1 =21

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

the length of o'p' is .

step-by-step explanation:

it is given that the quadrilateral m'n'o'p' is the image of quadrilateral mnop after dilation.

the center of dilation is origin and the scale factor is 1.5.

in dilation the image and preimge are similar figures. it means the sides of image and preimage are proportional.

the scale factor is defined as

the scale factor is 1.5.

multiply both sides by op.

note: if the value of op is given, then multiply the value of op with 1.5 to get the length of side o'p'.

therefore length of o'p' is .