Solve the problem.Joe has a collection of nickels and dimes that is worth $6.25. If the number of dimes were doubled and the number of nickels were increased by 9, the value of the coins would be $10.90. How many dimes does he have?
A. 9 dimes
B. 42 dimes
C. 41 dimes
D. 21 dimes
Answer: B
Mathematics
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A. 5(x + 1)5(3x2 + 7x + 2) B. (x + 1)5(3x2 + 7x + 2) C. 5(x + 1)6(3x + 2) D. 5(x + 1)5(x2 + 3x)
Mathematics
Simplify the expression. Assume that all variables are positive.
? 
A. 
B. 
C. 15x4
D. x4
Mathematics
Solve the system by the substitution method.x2 + y2 = 41x + y = 9
A. {(5, 4), (4, 5)} B. {(-5, -4), (-4, -5)} C. {(5, -4), (4, -5)} D. {(-5, 4), (-4, 5)}
Mathematics
Find an equation for the line with the given properties.Perpendicular to the line x = 4; containing the point (1, 3)
A. x = 1 B. y = 1 C. y = 3 D. x = 3
Mathematics