Solve the problem.The sum of the squares of the digits of a positive two-digit number is 20, and the tens digit is 2 more than the units digit. Find the number.
A. 42
B. 35
C. 53
D. 24
Answer: A
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Find the coordinates of the vertices and the foci of the hyperbola.25y2 - x2 = 6.25
A. V(-2.5, 0), V(2.5, 0), F(-6.5, 0), F(6.5, 0)
B. V(0, -0.5), V(0, 0.5), F
, F
C. V(-2.5, 0), V(2.5, 0), F
, F
D. V(0,-0.25), V(0, 0.25), F(0, -6.5), F(0, 6.5)
Solve the equation.
x - 
= -2
A. -5 B. 3 C. 5 D. -3
Write a chain rule formula for the following derivative.
for u = f(v); v = h(s, t)
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Solve the problem by writing and solving a suitable system of equations.If 20 pounds of tomatoes and 10 pounds of bananas cost $17 and 
of tomatoes and 
of bananas cost $39, what is the price per pound of tomatoes and bananas?
A. tomatoes: $0.70 per pound; bananas: $0.50 per pound B. tomatoes: $0.50 per pound; bananas: $0.70 per pound C. tomatoes: $0.70 per pound; bananas: $0.30 per pound D. tomatoes: $0.60 per pound; bananas: $0.50 per pound