Agroup of college students are volunteering for the homeless during their spring break. they are putting the finishing touches on a house they built. working alone, irina can paint a certain room in 7 hours. paulo can paint the same room in 6 hours. choose the equation that can be used to find how long it will take them working together to paint the room. how many hours will it take them to paint the room? if necessary, round your answer to the nearest hundredth.

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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step-by-step explanation:

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