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A) 15 cm B) 1292 cm^2

Step-by-step explanation:

A) height can be used by using Pythagoras theorem

Height^2+base^2=slant^2

height^2+8^2=17^2

height=15 cm

B) The amount of cardboard used can be found by calculating the area

Area=2*(area of triangle) + 3*(area of rectangles)

17*16+3*(20*17)=1292 cm^2

a- 15 b- 1292^cm this is the answer

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

exactly you go it

step-by-step explanation: