Find the value of the missing number.
= 20
A. -95
B. -25
C. -80
D. -100
Answer: D
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Add the given vectors.
A. R = 4600, ? = 35° B. R = 2800, ? = 113° C. R = 4600, ? = 215° D. R = 2800, ? = -67°
Solve.The power that a resistor must dissipate is jointly proportional to the square of the current flowing through the resistor and the resistance of the resistor. If a resistor needs to dissipate 
of power when 
of current are flowing through the resistor whose resistance is 
find the power that a resistor needs to dissipate when 
of
current are flowing through a resistor whose resistance is 
A. 12 watts
B. 18 watts
C. 6 watts
D. 30 watts
Determine whether the selection is a permutation, a combination, or neither.Mary baked 3 pies: 1 for her father, 1 for her friend Joe, and 1 for her coworkers.
A. neither B. permutation C. combination
Solve the problem.The table shows the number of new cases (in thousands) of a certain disease diagnosed in a country in various years. 
Let f(t) be the number of new cases (in thousands) of the disease diagnosed at t years since 2010. Suppose that you wish to model f using a quadratic equation. What is the vertex of the model? What does it mean in this situation?
A. (3, 39.3); the smallest number of new cases diagnosed was 39,300 in the year 2013 B. (0, 49.4); the largest number of new cases diagnosed was 49,400 in the year 2010 C. (0, 39.3); the smallest number of new cases diagnosed was 39,300 in the year 2010 D. (7, 45.7); the largest number of new cases diagnosed was 45,700 in the year 2017