Find the sum of 4x3 + 2x2 - 4x + 3 and 7x3 -4x2 + 7x + 8

  11x^3 -2x^2 +3x +11

Step-by-step explanation:

(4x^3 + 2x^2 - 4x + 3) + (7x^3 -4x^2 + 7x + 8)

= (4+7)x^3 +(2 -4)x^2 +(-4+7)x +(3 +8) . . . . add the coefficients of like terms

= 11x^3 -2x^2 +3x +11

yes

step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk