I need help i don’t understand

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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?

Divide. –40 ÷ –5 a –8 b 200 c -200 d 8