Asquare and a regular heptagon are coplanar and share a common side $\overline{ad}$, as shown. what is the degree measure of angle $bac$? express your answer as a common fraction.

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

How many significant figures are there in the number 10.76?