Solve the problem.The population of one city (in thousands) was 84.5 in 1970, 96.1 in 1980, and 100.8 in 1990. Let  correspond to 1970 and  to 1990. find the rule of a piecewise linear function f that models this data, that is a piecewise function with   and 

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A. f(x) = 
B. f(x) = 
C. f(x) = 4.990x + 84.5
D. f(x) = 

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Answer: A

Mathematics

Solve the problem.Find the equation for the tangent plane to the surface    at the point  

A. 2x + y + 30z = 33 B. 20x + 20y - z = 38 C. 20x + 20y - z = 30 D. 2x + y + 30z = 1

Solve the system by the substitution or the addition method.

A. (4, -4) B. (12, -5) C. (4, 4) D. (12, 3)

Graph using the slope and the y-intercept.2x - y = 4

A.

B.

C.

D.

Clear fractions then solve by substitution. +  = 4 - 2y = 21

A. {(6, -8)}
B. ?
C.
D. {(-6, 8)}