Solve.-12 + 10y = 15y + 3
A. y = 3
B. y = -2
C. y = -3
D. y = 2
Answer: C
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Determine whether the function is a solution of the wave equation.w(x, t) = ex - ct
A. No B. Yes
Solve the problem.A ball is dropped from a cliff that is 192 feet high. The distance S (in feet) that it falls in t seconds is given by the formula 
How many seconds will it take for the ball to hit the ground? Round to the nearest tenth when necessary.
A. 2304 sec B. 3.5 sec C. 13.9 sec D. 13.3 sec
It makes sense that the larger the area of a region, the larger the number of species that inhabit the region. Many ecologists have modeled the species-area relation with a power function and, in particular, the number of species S of bats living in caves in central Mexico has been related to the surface area A measured in 
of the caves by the equation
S = 0.7A03
(a) The cave called mission impossible near puebla, mexico, has suface area of A=90m2.
How many species of bats would expect to find in that cave?
(b) If you discover that 5 species of bats live in cave estimate the area of the cave.
Determine if the function is increasing or decreasing over the interval indicated.y = -6x3 ; x < 0
A. Increasing B. Decreasing