Write the vector v in terms of i and j whose magnitude 
and direction angle ? are given.
= 10, ? = 120°
A. v = 5
i - 5j
B. v = 5i - 5
j
C. v = -5i + 5
j
D. v = -5
i + 5
j
Answer: C
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Simplify the difference quotients 
and 
for the following function. Rationalize the numerator when necessary.f(x) = 
A. 
; 
B. 
; 
C. - 
; - 
D. - 
; - 
Use a power regression model for the following data to answer the following question. If x is halved, what is the effect on y? Round your answer to two decimal places. ? x 2.96 4.89 5.35 6.2 7.51 y 7.98 3.52 3.11 3.66 3.25?
A. y is decreased by 97.25%. B. y is increased by 97.25%. C. y is decreased by 197.25%. D. y is increased by 197.25%.
Solve the problem.Under standard conditions, molecules of a gas collide billions of times per second. If each molecule has diameter t, the average distance between collisions is given by 
where n, the volume density of the gas, is a constant. Find 
.
A. 
= - 
B. 
= - 
C. 
= 
D. 
= - 
Verify that the values of the variables listed are solutions of the system of equations.
x = -1, y = 3
A. solution B. not a solution