You can represent the measures of an angle and its complement as x° and (90 − x)°. Similarly, you can represent the measures of
an angle and its supplement as x° and (180 − x)°. Use these expressions to find the measures of the angles described. The measure of an angle is equal to twice the measure of its supplement.
The measure of the angle is
° and the measure of its supplement is
°.
It would be 4200 x 1.09 which is the interest to the power of 6 for the number of years which would then give you 4200 x 1.09^6. This will then give the answer of 7043.82