An object is launched direly upward at 64 feet per second from a platform 80 feet high. The equation for the object's height is h(t) = -16t + 64t +80. At how many seconds, to the nearest tenth of a second, will the object have a height of 90 feet?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.