If r and t are the measures of two acute angles so that r + t = 90° , then cos r equals: (1) sin(90° - t)

(2) sin(t + 90°)

(3) sin(t - 90°)

(4) sin t

Which of the following is true about the graph of f(x)=7^x. select all that apply. a= it intercepts the x axis b=it intercepts both axis c=it intercepts neither d=it intercepts the y axis

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)