Can someone me out with this n you

The answer to your question is: A = 25.12 ft²

Step-by-step explanation:

Data

Width = 8 ft

Length = 10 ft

Area of the rectangle = base x length

Area of the circle = πr²

Process

Area of the rectangle = 10 x 8 = 80 ft²                  Substitution

Area of the semicircle = (3.14 x 4²) / 2

                                     = 25.12 ft²

Total area = A rectangle + A semicircle

                 = 80 + 25.12

                 =  105.12 ft²

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."