Write a formula for the nth term of the arithmetic sequence. Use the formula to find the 20th term of the sequence.2, 6, 10, 14, 18, . . .
A. an = 2n - 4; a20 = 36
B. an = 4n - 2; a20 = 78
C. an = n + 4; a20 = 24
D. an = 4n + 2; a20 = 82
Answer: B
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Solve the problem. Assume all data are accurate to two significant digits unless greater accuracy is given.Two cities are 81.4km apart. Vehicle A leaves one city at the same time vehicle B leaves the other. Find the speed of vehicle A if it travels 6.5 km/h faster than vehicle B and if they pass in 14.7 minutes.
A. 6.0 km/h B. 169.4 km/h C. 166.3 km/h D. 162.9 km/h
Find the LCM of the set of numbers.10, 80
A. 90 B. 10 C. 80 D. 800
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400
Suppose the angle formed by the line y = 4x and the positive x-axis is ?. Find the tangent of ?.
?
?
A. ?
B. 4
C. 5
D. -4
E. 