A projectile is thrown upward so that its distance above the ground after t seconds is h = -16t2 + 608t. After how many seconds does it reach its maximum height?

38 s
19 s
28.5 s
9 s

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'