The annual sales of Crimson Pharmacy are expected to be given by S = 2.4 + 0.3t million dollars t years from now, whereas the annual sales of Cambridge Pharmacy are expected to be given by S = 1.1 + 0.7t million dollars t years from now. When will Cambridge's annual sales first surpass Crimson's annual sales?

Question

_____years from now

Answer 1

These are straight lines, they cross once.

2.4 +.3 t = 1.1 + .7 t

.4 t = 1.3

t = 13/4 = 3 1/4 years