Solve the system of equations by the substitution method.5x - 6y = 20 - 5x5x + 7y = x + 6y + 25
A. 
B. {(5, -5)}
C. {(0, 20)}
D. {(5, 5)}
Answer: D
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Use the change-of-base formula and a calculator to evaluate each logarithm.log? 200
A. 1.1447 B. 0.2161 C. 4.6284 D. 5.2983
Solve.If the three lengths of the sides of a triangle are known, Heron's formula can be used to find its area. If a, b, and c are the three lengths of the sides, Heron's formula for area is: A = 
where s is half the perimeter of the triangle, or s = 
(a + b + c).Use this formula to find the area of the triangle if a = 6 cm, b = 8 cm and c = 10 cm. 
A. 24
sq. cm
B. 48
sq. cm
C. 24 sq. cm
D. 4
sq. cm
Find the sum.306 mi + 0.38 mi + 89.62 mi + 47 mi + 7 mi
A. 450.1 mi B. 450.01 mi C. 451 mi D. 450 mi
Use the order-of-operations agreement to simplify.x2
÷ x
A. 
B. x4 - 10
C. x - 10
D. x2 - 10