Use the substitution method to solve the system.x + y = -6x - y = 15
A. (4.5, 10.5)
B. (4.5, -10.5)
C. (6, -10.5)
D. (6, 4.5)
Answer: B
Mathematics
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At the given point, find the slope of the curve or the line that is tangent to the curve, as requested.x5y5 = 32, slope at (2, 1)
A. - 
B. 2
C. 16
D. - 
Mathematics
Use sum-to-product identities to rewrite the expression as a product.cos 61° + cos 35°
A. 2 sin 48° cos 13° B. -2 sin 48° sin 13° C. 2 cos 48° cos 13° D. 2 cos 48° sin 13°
Mathematics
Without graphing the function, determine its amplitude or period as requested.y = cos 3xFind the period.
A. 3
B. 1
C. 2?
D. 
Mathematics
Simplify.
÷ 
? 
A. 
B. 
C. 2.5
D. 10
Mathematics