Solve.A pendulum bob swings through an arc 50 inches long on its first swing. Each swing thereafter, it swings only 68% as far as on the previous swing. What is the length of the arc after 7 swings? Round your answer to two decimal places, if necessary.
A. 3.36 inches
B. 4.94 inches
C. 2.29 inches
D. 204 inches
Answer: B
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Solve the formula for the indicated variable. Then use the supplied values to solve the equation.The total surface area of a rectangular solid of length L, width W, and height H is given by 
Solve for H. What is the height if the area A is 2768 cm2, the length is 35.5 cm, and the width is 12.9 cm? (All measurements are approximate.)
A. H = A - 2LW - 2L - 2W = 1760 cm
B. H = 
= 1160 cm
C. H = 
= 47.7 cm
D. H = 
= 19.1 cm
Simplify completely.- 
A. 
B. 
C. - 
D. - 
Perform the operation and simplify, or solve the equation for the variable.
- 
A. 
B. 
C. 
D. 
Solve the problem.The correlation between respiratory rate and body mass in the first three years of life can be expressed by the function log R(w) = 1.88 - 0.36 log (w),where w is the body weight (in kg) and R(w) is the respiratory rate (in breaths per minute). Find R'(w) using implicit differentiation.
A. R'(w) = -27.31w-0.64 B. R'(w) = -27.31w-0.36 C. R'(w) = -27.31w-1.36 D. R'(w) = 75.86w-1.36