Marco and elaine are building a stand like the one shown to display trophies.

68 square feet is the total surface area of the stand.

Step-by-step explanation:

Since both the parts of the stand are in the shape of prism.

Therefore surface area of the stand = surface area of horizontal prism + surface area of vertical prism

Since the formula of surface area of prism = 2(lw + lh + hw)

where l = length, w = width, h = height

Now for horizontal prism

l = 7 ft. , w = 1 ft. , h = 2 ft

Therefore area of horizontal prism = 2(7×1 + 7×2 + 2×1) = 2×23 = 46 square feet

Now dimensions of the vertical prism

l = 3 ft. , w = 2 ft. , h = 1 ft.

and area = 2(3×2 + 3×1 + 1×2) = 2(11) = 22 square feet.

Now the area of whole structure will be = 46 + 22 = 68 square feet.

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.

depends on how many days you are talking about

step-by-step explanation: