What does it mean 'what is the value' of a number

b) 36

step-by-step explanation:

18 times 2 is 36

i believe the answer is the polygon, heptagon.

m∠a is 90°

m∠b is 40°

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4