Abuilding is 20 ft talk and cast a 12 foot shadow, and a person who is standing right next to the building cast a 3 ft shadow, how tall would the person be

5 ft

Step-by-step explanation:

The shadow of the person is 1/4 the length of the shadow of the building, so the person will be 1/4 the height of the building: 5 ft.

As this is college math, you would be expected to know that 3 ft × 4 = 12 ft, and 5 ft × 4 = 20 ft. You are also expected to know that shadow lengths are proportional to object heights.

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

what level of math? also i don't need to be paid if i can you.