Write the phrase as an algebraic expression. Let x represent the unknown number.The product of a number and 18
A. x - 18
B. 18x
C. 
D. x + 18
Answer: B
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A 1500-liter tank contains 70 liters of a 30% acid solution and you add x liters of a 70% acid solution to the tank. If the function C, which represents the proportion of acid to the total solution in the final mixture, is given by 
determine the domain based upon the physical constraints of the problem.
a. 
b. 
c. 
d. 
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
Find the coordinates of the vertex of the parabola.y = 2x2 - 12x + 20
A. (-3, -2) B. (-2, -3) C. (2, 3) D. (3, 2)
Solve the problem.A scarf manufacturer requires 
yard of fabric for each scarf produced. Find the number of scarves that can be made from 867 yards of fabric.
A. 520 scarves B. 1445 scarves C. 2168 scarves D. 347 scarves