Solve the equation for the specified variable.A = lw; solve for w
A. w = 
B. w = Al
C. w = A - l
D. w = 
Answer: D
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Parametric equations and and a parameter interval for the motion of a particle in the xy-plane are given. Identify the particle's path by finding a Cartesian equation for it. Graph the Cartesian equation. Indicate the portion of the graph traced by the particle and the direction of motion.x = 49t2, y = 7t, -? ? t ? ?
A. y = x2; Entire parabola, left to right (from
2nd quadrant to origin to 1st quadrant)
B. y = x2; Entire parabola, right to left (from
1st quadrant to origin to 2nd quadrant)
C. x = y2; Entire parabola, bottom to top (from
4th quadrant to origin to 1st quadrant)
D. x = y2; Entire parabola, top to bottom (from
1st quadrant to origin to 4th quadrant)
Answer as requested.Suppose that there is perfect positive correlation between the number of hours studied for a test and score on the test. Which of the following statements must be true? More than one statement may be true.A: If we know the number of hours a given student studied, we will be able to perfectly predict their test score.B: If Anne studied twice as long as Manuel, she will score twice as much.C: If Lu Yi studied ten hours more than Andrea, Lu Yi will score ten points more than Andrea. D: All data points lie perfectly on a horizontal line.
A. All statements are true B. A C. B and C D. A and D
Factor completely. If the polynomial is prime, so state.16x + 32x2 + 7x3
A. 7x(x + 4)(x + 4) B. x(7x + 4)(x + 7) C. x(x + 4)(7x + 4) D. prime
Solve using matrices.A chemist has prepared two acid solutions, one which is 6% acid by volume and the other which is 10% acid. How many cubic centimeters of each should the chemist mix together to obtain 50 cm3 of 
-acid solution?
A. 6%-solution: 3.76 cm3; 10%-solution: 46.24 cm3 B. 6%-solution: 46.24 cm3; 10%-solution: 3.76 cm3 C. 6%-solution: 25 cm3; 10%-solution: 25 cm3 D. 6%-solution: 31 cm3; 10%-solution: 19 cm3