Answer:
a cube that is 1 yard long, 1 yard wide, and 1 yard high
Step-by-step explanation:
The dimensions for a unit cube are:

<u>Please note that the units for each side MUST be the same (or if they're different, then the lengths have to be equivalent). </u>
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Looking at the answer choices, we can see that the last answer choice is a 1 yd by 1 yd by 1 yd cube, therefore it is a unit cube.
Its a vertical line so the only value which defines it is the value of x where it passes through the x-axis.
Its equation is x = -2.
Percent means parts out of 100
85%=85/100=0.85
'of' means multiply
therefor
85% of x equals 17 means
0.85 times x=17
divide both sides by 0.85
x=20
the number is 20
The first one
Because you are dividing the second triangle by the first one