Select the correct answer. The sum of two complementary angles is 90°. For one pair of complementary angles, the measure of the first angle is 15 less than twice the
measure of the second angle. Write system of equations that can be used to determine the measure of the first d, angle, a, and the measure of
the second angle, b.

A. a+b=90, 2b-15=a

B. a+b=90, 2b+15=a

C. a+b=90, a-2b=15

D. a+b=90, 2a-15=b

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?