Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
Answer: A
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Is the magnitude of an earthquake related to the depth below the surface at which the quake occurs? Let x be the magnitude of an earthquake (on the Richter scale), and let y be the depth (in kilometers) of the quake below the surface at the epicenter. Suppose a random sample of earthquakes gave the following information.
x
2.5
4
3.40
4.4
2.4
y
5.2
10.3
10.8
10.3
8.3
Draw the line that best fits the data whose scatter diagram is given below.
A.
B.
C.
D.
E.
Use the quadratic formula to find the exact solutions.x2 + 10x = -16
A. -2, 8 B. -2, -8 C. -8, 2 D. 2, 8
Describe the given set of points with a single equation or with a pair of equations.The set of points equidistant from the points (0, 0, -7) and (0, 0, 1)
A. x + y = -3 B. z = -3 C. z > -7 and z < 1 D. x + y = 0 and -7 < z < 1
The size of two matrices is given. Find the size of the product AB and the product BA, if the products exist.A is 2 × 1, B is 1 × 1.
A. AB is 2 × 1, BA is undefined. B. AB is 1 × 2, BA is 1 × 1. C. AB is undefined, BA is 1 × 2. D. AB is 2 × 2, BA is 1 × 1.