Astudent needs at least 80% of all points on the tests in a class to get a b. there are three 100-point tests and a 250-point final. the student's test scores are 72%, 85%, and 78% for the 100 point tests. what is the least score the student can make on the final and still get a b?

How many points are there total? (3*100)+250 = 550

So far, he has 72 + 85 + 78, or 235

He needs 0.80 * 550 for a B, or 440 points

440 - 235 = 205 points on the final to get a B

Percentage-wise, he needs 205/250, or 0.82

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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