( 5
x
2
−
3
x
)
+
(
4
x
2
+
7
x
−
1
)
−
(
2
x
2
+
4
x
)

7x^2-1

Step-by-step explanation:

14x-1

( 5 x 2 − 3 x ) + ( 4 x 2 + 7 x − 1 ) − ( 2 x 2 + 4 x ) =

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2

y= 2x+7

changed to y= 5x +7

as slope is increased from 2 to 5

therefore it would be less steeper

so, option d) is correct