Find sum (2x^2 + x +3) + (3x^2 + 2x + 1)

5x² + 3x + 4

remove parenthesis and collect like terms

2x² + x + 3 +3x² + 2x + 1

= (2x² + 3x²) + (x + 2x ) + 3 + 1

= 5x² + 3x + 4

6.9

step-by-step explanation:

simple math really

6 1/2 times 0.6 = 3.9

but if you are just doing 6 and not 6 1/2 then the answer is 3.6

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm