Solve the given equation by finding the unknown value.38 ? ? = 0
A. 38
B. not possible
C. 1
D. 0
Answer: D
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Solve the given applied problems involving variation.The gravitational attraction A between two masses varies inversely as the square of the distance between them. The force of attraction is 4 lb when the masses are 3 ft apart, what is the attraction when the masses are 6 ft apart?
A. 4 lb B. 3 lb C. 1 lb D. 2 lb
The concentration of a drug in an organ at any time t (in seconds) is given by 
where x(t) is measured in grams/cubic centimeter (g/cm3).
?
Select the graph of x.
?
A. ?
B. ?
C. ?
D. ?
E. ?
Simplify. Write your answers in the form of a+bi, where a and b are real numbers.(6 - 
) (3 + 
)
A. 78 - 42 i B. 78 + 42 i C. -78 + 42 i D. 3618 + 708 i
Solve.How many 3-letter codes can be formed with the letters P, Q, R, S, T without repetition?
A. 30 B. 60 C. 6 D. 180