Use the formula B = P + Prt, which is used to calculate the balance in an account if simple interest is added to a principal P at an interest rate of r for t years.Suppose that an account earns 4.7% interest and after two years the balance is $4055.00. Find the principal that was invested.
A. $3335.92
B. $4475.72
C. $3706.58
D. $4447.90
Answer: C
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 
A. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: parabolas 
B. Domain: all points in the xy-plane except y = 0; range: real numbers z ? 0 ; level curves: parabolas 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: parabolas 
D. Domain: all points in the xy-plane except y = 0; range: all real numbers; level curves: parabolas 
Graph the function.f(x) = 
A. 
B. 
C. 
D. 
The annual rate, r, compounded annually, it takes for 
dollar to grow to A dollars in 4 years is given by the formula 
. Find the rate necessary for a dollar to double in 4 years.
?
Give your answer to one decimal place, if required.
?
__________%
Fill in the blank(s) with the appropriate word(s).
Solve the problem. Give the answer to the nearest thousandth if necessary.A long-distance runner runs 4 miles south and then 9 miles east. How far is the runner from the starting point? 
East --9 mi-->
A. 13 mi B. 9.849 mi C. 5.099 mi D. 10.849 mi