Solve the equation after making an appropriate substitution.x + 
= 72
A. {8}
B. {9}
C. {64}
D. {81}
Answer: C
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Find all real numbers in [0, 2?] that satisfy the equation.cos 2x = 
A. 
, 
, 
, 
B. 0, 
, ?, 
C. 
, 
, 
, 
D. no solution
Solve the system of equations by the substitution method. Check your solutions. For any dependent equations, write your answer in the ordered pair form.
A. {(1, -12)} B. {(2, -14)} C. {(-14, 2)} D. {(3, -22)}
Solve.A fossilized leaf contains 34% of its normal amount of carbon 14. How old is the fossil? Use 5600 years as the half-life of carbon 14 and round to the nearest year.
A. 33,788 yr B. 28,438 yr C. 8700 yr D. 3351 yr
Solve the problem.In a distant galaxy the gravity of planet A is 217 times as strong as the gravity of planet B, so objects on planet A weigh 217 times as much as they weigh on planet B. If the object weighs 
on planet A, how much does it weigh on plant B?
A. 149 lb. B. 132 lb. C. 139 lb. D. 1390 lb.