Write the equation of a circle with the given center and radius.Center at (0, 0); Radius 7
A. x2 - y2 = 
B. x2 - y2 = 7
C. x2 + y2 = 49
D. x2 + y2 = 7
Answer: C
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Solve the problem.A salesperson has two job offers. Company A offers a weekly salary of $210 plus commission of 14% of sales. Company B offers a weekly salary of $420 plus commission of 7% of sales. What is the amount of sales above which Company A's offer is the better of the two?
A. $1500 B. $3000 C. $3100 D. $6000
Solve the problem.On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by y = sin (2?lt) and y = sin (2?ht)where l and h are the low and high frequencies (cycles per second) shown on the illustration.
The sound produced is thus given by y = sin (2?lt) + sin (2?ht)Write the sound emitted by touching the 4 key as a product of sines and cosines.
A. y = 2 sin (439?t) cos (1,979?t) B. y = 2 sin (2,106?t) cos (566?t) C. y = 2 sin (566?t) cos (2,106?t) D. y = 2 sin (1,979?t) cos (439?t)
Use the commutative law of multiplication to write an equivalent expression.7x
A. x7 B. 7(x) C. 7(x + 1) D. 7 + x
When the behavior of one or more research participants is measured over time, this is called __________ research.
A. longitudinal B. developmental C. cross-sectional D. sequential