Please help me I dont know

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

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?

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250