Use the arc length formula and the given information to find the indicated quantity.r = 4 in., ? = 11 rad; find s
A. 88 in.
B. 44 in.
C. 
in.
D. 
in.
Answer: B
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Find the position vector of a particle that has the given acceleration and the given initial velocity and position.
a(t) = -4k, v(0) = i + j - 20k, r(0) = 4i + 9j
Solve the system of equations by the substitution method.
A. (-20, 5) B. (5, -20) C. infinite number of solutions D. no solution
A 140-foot antenna is on top of a tall building. From a point on the ground, the angle of elevation to the top of the antenna is 27.5°, while the angle of elevation to the bottom of the antenna from the same point is 22.5°. How tall is the building? Please round to the nearest foot. ?
A. 549 ft B. 546 ft C. 545 ft D. 543 ft E. 548 ft
Solve the problem using matrices.A chemist has prepared two acid solutions, one of which is 4% acid by volume, another 11% acid. How many cubic centimeters of each should the chemist mix together to obtain 50 cm3 of a solution that is 
acid.
A. 31 cm3 of 4%; 19 cm3 of 11% B. 3.33 cm3 of 4%; 46.67 cm3 of 11% C. No solution D. 20 cm3 of 4%; 20 cm3 of 11%