Determine the constant of variation for the stated condition.t varies jointly as r and s, and t = 54 when r = 27, and s = 18.
A. k = 
B. k = 9
C. k = 18
D. k = 
Answer: D
Mathematics
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Convert the measurement to the specified units. Round to the nearest tenth of a degree, when necessary.In Dana's hometown, the highest temperature ever recorded is 111°F. Convert this temperature to Celsius.
A. 43.9° Celsius B. 29.7° Celsius C. 79.4° Celsius D. 231.8° Celsius
Mathematics
Find the equation for the tangent to the curve at the given point.f(x) = x2 + 5x ; (4, 36)
A. y = -39x - 80
B. y = 
+ 
C. y = 13x - 16
D. y = - 
+ 
Mathematics
Perform the indicated operations. Express the answer as a single polynomial in standard form.8x(4x + 10)
A. 32x2 + 80x B. 32x2 + 10x C. 112x2 D. 4x2 + 80x
Mathematics
Graph the circle.x2 + y2 - 6x = -10y - 18 
A. 
B. 
C. 
D. 
Mathematics