Identify the equation as either an identity or not.cos2x - sin2x = 1 - 2 sin2x
A. Identity
B. Not an identity
Answer: A
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Estimate the value of the quantity.The table gives dye concentrations for a cardiac-output determination. The amount of dye injected was 
Plot the data and connect the data points with a smooth curve. Find the area under the curve using rectangles. Use this area to estimate the cardiac output.
Dye concentration (mg/L)
Time (sec)
A. 18.9 L/min B. 9.4 L/min C. 381.6 L/min D. 0.2 L/min
Suppose that y is inversely proportional to x. Use the given information to find the constant of proportionality k. Then use y = 
to find y for the given value of x.y = 32 when x = 9;
Find y given x = 8.
A. k = 144; y = 18
B. k = 72; y = 9
C. k = 
; y = 
D. k = 288; y = 36
Solve the problem.A retired couple has $160,000 to invest to obtain annual income. They want some of it invested in safe Certificates of Deposit yielding 6%. The rest they want to invest in AA bonds yielding 11% per year. How much should they invest in each to realize exactly $15,100 per year?
A. $120,000 at 11% and $40,000 at 6% B. $110,000 at 11% and $50,000 at 6% C. $110,000 at 6% and $50,000 at 11% D. $100,000 at 6% and $60,000 at 11%
Solve.A cube has a surface area of 54 square feet. Find the length of a side.
A. 3 ft B. 18 ft C. 9 ft D. 4 ft