Solve the problem.How much pure acid should be mixed with 9 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 13.5 gal
B. 36 gal
C. 4.5 gal
D. 22.5 gal
Answer: A
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Use the graph to evaluate the expression.Find (f ? g)(4) and (g ? f)(3).
A. (f ? g)(4) = 3; (g ? f)(3) = 0 B. (f ? g)(4) = 35; (g ? f)(3) = 0 C. (f ? g)(4) = 29; (g ? f)(3) = -24 D. (f ? g)(4) = 35; (g ? f)(3) = 18
Solve the problem.A sail on a sailboat is supported by a mast and a boom. The length and direction of the mast and boom can be described by the vectors m = i - 4j + 5k and b = -2i + 3j + k, respectively, where the components are in meters. Find the angle (to the nearest tenth of a degree) between the mast and boom.
Fill in the blank(s) with the appropriate word(s).
Evaluate 
and round the answer to two decimal places.
A. -0.37 B. 5.18 C. -4.14 D. -4.15 E. -0.97
Find all cube roots of the complex number. Leave answers in trigonometric form.3 + 3i
A. 
cis 20°, 
cis 140°, 
cis 260°
B. 
cis 20°, 
cis 140°, 
cis 260°
C. 
cis 30°, 
cis 150°, 
cis 270°
D. 
cis 20°, 
cis 140°, 
cis 260°