Solve the problem.Martin purchased some municipal bonds yielding 8% annually and some certificates of deposit yielding 11% annually. If Martin's investment amounts to $23,000 and the annual income is $2230, how much money is invested in bonds and how much is invested in certificates of deposit?
A. $13,000 in bonds; $10,000 in certificates of deposit
B. $15,000 in bonds; $8000 in certificates of deposit
C. $8000 in bonds; $15,000 in certificates of deposit
D. $10,000 in bonds; $13,000 in certificates of deposit
Answer: D
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Evaluate.7 ? (8 - 15)2
A. -49 B. 343 C. -343 D. 49
Solve the problem.A laminated lab bench has 
of plywood, 
of pressed board, and 
of formica. What is the thickness of the lab bench?
A. 1
in.
B. 
in.
C. 
in.
D. 3
in.
Solve the problem.An artifact is discovered at a certain site. If it has 61% of the carbon-14 it originally contained, what is the approximate age of the artifact? (carbon-14 decays at the rate of 0.012% annually.)
A. 4119 yr B. 3250 yr C. 1789 yr D. 5083 yr
Beams of light parallel to the axis of the parabolic mirror shown in the figure strike the mirror and are reflected. Find the distance from the vertex to the point where the beams concentrate.
?
a = 12 ft, b = 8 ft
?
?
A. The focus is 32 in. from the vertex on the axis of the parabola. B. The focus is 16 in. from the vertex on the axis of the parabola. C. The focus is 12 in. from the vertex on the axis of the parabola. D. The focus is 8 in. from the vertex on the axis of the parabola.