Evaluate the expression without a calculator.-4-3
A. 
B. -64
C. 64
D. - 
Answer: D
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Find the least common multiple.18, 13
A. 78 B. 13 C. 31 D. 234
If the number in the statement is written in scientific notation, write it without exponents. If it is written without exponents, write it in scientific notation.It has been estimated that the average American watches 58,240 hours of television in a lifetime.
A. 5.824 × 104 hr B. 5.824 × 103 hr C. 5.824 × 105 hr D. 58.24 × 103 hr
Vector v has the given magnitude and direction. Find the horizontal or vertical component of v, as indicated, if ? is the direction angle of v from the horizontal. Round to the nearest tenth when necessary.? = 23.7°, ?v? = 751; Find the vertical component of v.
A. 687.7 B. 301.9 C. 989.6 D. 385.8
A 30-ft ladder leaning against a wall begins to slide. How fast is the top of the ladder sliding down the wall at the instant of time when the bottom of the ladder is 18 ft from the wall and sliding away from the wall at the rate of 3 ft/sec?
?
Hint: Refer to the accompanying figure. By the Pythagorean theorem, 
. Find 
when 
and 
.
?
a = 30; b = 3
?
A. 4 ft/sec
B. 
ft/sec
C. 
ft/sec
D. 3 ft/sec
E. 
ft/sec