A formula is given, along with values for all but one of the variables in the formula. Find the value of the variable that is not given.C = 2?r; r = 9, ? = 3.14
A. C = 18
B. C = 354.95
C. C = 59.66
D. C = 56.52
Answer: D
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Solve the problem.A chemist needs 11 liters of a 50% salt solution. All she has available is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
A. 3.3 liters of the 20% solution; 7.7 liters of the 70% solution B. 4.4 liters of the 20% solution; 6.6 liters of the 70% solution C. 5.5 liters of the 20% solution; 5.5 liters of the 70% solution D. 2.2 liters of the 20% solution; 8.8 liters of the 70% solution
Express the function, f, in simplified form. Assume that x can be any real number.f(x) = 
A. f(x) = 
B. f(x) = 7(x + 2)
C. f(x) = 7(x + 2)2
D. f(x) = 
Divide. Assume all variables are nonzero.
A. 7x2y7 B. 7x3y7 C. 60x3y7 D. 7x3y6
The tangent line to the graph of 
at 
is shown. On the tangent line, P is the point of tangency and A is another point on the line. Find the instantaneous rate of change of 
style="vertical-align:middle;" /> at P.
?
?
A. -3
B. 3
C. -4
D. -5
E. does not exist