Please help///quickly im being timed//also please show your workdue in 15 mins 4. A radioactive compound has a half-life of 50 years. When will there be less than 20% of anoriginal quantity left?

5. How many years did it take you to pay off an $45,000 car at 18% simple interest if you paid a total of $85,500?

dont understand

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

well my understanding of this question is they want you to use the y=14.1x -2.3 and put the coordinates they gave you onto the line segment of   y=14.1x -2.3

step-by-step explanation: