Solve the problem.When a person bends at the waist with a straight back, the force, F, exerted by the person's lower back muscles can be estimated with the formula 
where w is the person's weight, and ? is the angle made by the person's torso relative to the horizontal. Suppose that a 
person bends at an angle of 30°. Determine the force exerted by the person's back muscles, and estimate the angle that requires the back muscles to exert a force of 208 pounds. Round the force to the nearest pound, and the angle to the nearest tenth, if necessary.
A. 26 pounds; 53.1°
B. 300 pounds; 30°
C. 300 pounds; 53.1°
D. 173 pounds; 47.3°
Answer: C
Mathematics
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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = 8 + 3 cos tFind the body's speed at time t = ?/3 sec.
A. - 
m/sec
B. - 
m/sec
C. 
m/sec
D. 
m/sec
Mathematics
Write a numerical expression for the phrase and simplify it.18 less than the difference between 3 and -8
A. [3 - (-8)] - 18; -23 B. [3 - (-8)] - 18; -7 C. 18 - [3 - (-8)]; 7 D. (3 - 8) - 18; -23
Mathematics
Evaluate.
A. 34 B. 8 C. 17 D. 1
Mathematics
Divide. Write the result in standard form.
A. 
+ 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Mathematics