Write a formula to express the relationship. Use k as the constant of variation.The surface area of a sphere S varies directly as the square of its radius r.
A. S = 
B. S = k2r
C. S = 
D. S = kr2
Answer: D
Mathematics
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True or false?If I earn 50% more than you, then you must earn 33.3% less than me.
A. True B. False
Mathematics
Evaluate the integral in terms of natural logarithms.
A. 7 ln (4 + 
)
B. 4
C. ln (4 + 
)
D. 7 ln (1 + 
)
Mathematics
Use a proportion to solve the problem.If a spring stretches 8 meters when a 2-kilogram weight is attached to it, how much will it stretch when a 4-kilogram weight is attached to it?
A. 15 meters B. 19 meters C. 18 meters D. 16 meters
Mathematics
Express the integrand as a sum of partial fractions and evaluate the integral.
dx
A. 4 ln 
+ 
+ C
B. 2 ln 
- 
+ C
C. 4 ln 
+ 
+ C
D. 4 ln 
- 
+ C
Mathematics