Can you please explain how to do this so I can understand what to do for the other questions

The circle length is 90*pi which should be 3.14

So the circle length is 282.6

The central angle is 90 degree which is 1/4 part of 360 degree

From the theory of arc, the arc length should also be 1/4 part of circle length.

So the answer should be 1/4 * 282.6 = 70.65

Becasue it should be to the nearest tenth, so the answer should be 70.7

Step-by-step explanation:

-2 is the right

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.