Solve the problem.The time T necessary to make an enlargement of a photo negative varies directly as the area A of the enlargement. If 48 seconds are required to make a 
enlargement, find the time required for a 
enlargement.
A. 350 sec
B. 210 sec
C. 420 sec
D. 280 sec
Answer: D
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Decide whether the equation is conditional, an identity, or a contradiction. Give the solution set.8m + 10 = 2(2m - 5)
A. Identity; {all real numbers} B. Conditional; {-5} C. Conditional; {-0} D. Contradiction; ?
Find the area.
A. 12
m2
B. 25 m2
C. 11
m2
D. 22
m2
State (a) the precision, (b) the accuracy, and (c) the greatest possible error of the following measurement number.89 psi
A. (a) precise to the nearest ten, (b) 2 significant digits, (c) 5 psi B. (a) precise to the nearest ten, (b) 1 significant digit, (c) 5 psi C. (a) precise to the nearest whole number, (b) 2 significant digits, (c) 0.5 psi D. (a) precise to the nearest whole number, (b) 3 significant digits, (c) 0.5 psi
Estimate the indicated component or components of the vector. Round to an appropriate number of significant digits.
= 494, ? = 34.5°; Find the vertical component of v.
A. 407 B. 127 C. 687 D. 280