Evaluate the expression 6a - 3x - 2y, if a = 3, x = 7, and y = 4.
Answer(s): A
Replace the unknowns with the numbers given. (6 × -3) - (3 × -7) - (2 × 4) = -18 + 21 - 8 = -5.
(x + 4)(3x + 5) = __________.
Answer(s): C
(x + 4)(3x + 5)3x2 + 12x +5x + 203x2 + 17x + 20
Solve for x: 5x - 2x = 7x + 2x - 24
5x - 2x = 7x + 2x - 243x = 9x - 24-6x = -246x = 24x = 4
The cube of 6 is __________.
The cube of 6 = 6 × 6 × 6 = 216.
In the equation 3x + 7y = 21, at what point is the x-axis intersected?
The x access is intersected at the point where the y-coordinate is 0 (y = 0). Substitute 0 for the y variable in the equation. 3x + 7y = 21 = 3x + 7(0) = 21 = 3x = 21.Therefore, x = 7. The point's coordinates are (7, 0).
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