Write in scientific notation.0.0000070213
A. 7.0213 × 10-5
B. 7.0213 × 10-7
C. 7.0213 × 106
D. 7.0213 × 10-6
Answer: D
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Solve the problem.Find the sum of the infinite series 1 + 4r + r2 + 4r3 + r4 + 4r5 + r6 + ... for those values of r for which it converges.
A. 
B. 
C. 
D. 
Solve.A figure skater must trace a figure eight on the ice that consists of two perfect circles, each with a radius of 8 feet. What distance does the skater cover, tracing one time around the figure eight? Round results to the nearest tenth of a unit.
A. 100.4 ft B. 25.1 ft C. 50.2 ft D. 23.1 ft
Find an equation for the hyperbola described.Vertices at (±6, 0); foci at (±8, 0)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Find the sum of the finite geometric series.-9 + 27 - 81 + 243 - 729
A. S5 = -1845 B. S5 = -549 C. S5 = -63 D. S5 = 72