Add or subtract. Assume all variables represent nonnegative real numbers. - 7 - 5

A. -12
B. -12
C. -64
D. -64


Answer: C

Mathematics

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Express the number in scientific notation.2500

A. 2.5 × 10-2 B. 2.5 × 10-3 C. 2.5 × 103 D. 2.5 × 102

Mathematics

Solve.A vendor has learned that, by pricing caramel apples at $1.25, sales will reach 89 caramel apples per day. Raising the price to will cause the sales to fall to 49 caramel apples per day. Let y be the number of caramel apples the vendor sells at x dollars each. Write a linear equation that relates the number of caramel apples sold per day to the price x.

A. y = -40x - 139
B. y = - x + 
C. y = -40x + 139
D. y = 40x + 39

Mathematics

Find the equation in standard form of the parabola described.The vertex has coordinates (3, -5), and the focus has coordinates (4, -5).

A. (y + 5)2 = -4(x - 3) B. (x + 3)2 = -4(y - 5) C. (y + 5)2 = 4(x - 3) D. (x + 3)2 = 4(y - 5)

Mathematics

Solve the equation. + 4 = 11

A.  
B.
C.
D. ?

Mathematics