Shelley spent 17 minutes washing. she 38 minutes cleaning her room. explain how you can use mental math to find how long shelley spent on the two task

divide by 5

step-by-step explanation:

60/5 = 12

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq