Solve graphically.In a concrete mix, there is four times as much gravel as concrete. The total volume is 
. How much of each is in the mix ifx = the amount of concretey = the amount of gravelThe equations are
A. 
B. 
C. 
D. 
Answer: A
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Solve the problem using the quadratic formula.When water runs out of a hole in a cylindrical container, the height of the water in the container can often be modeled by a quadratic function. Assume that the height of the water in a particular metal can with a small hole can be modeled by h = 0.0005x2 - 0.15x + 8, where x is the time (sec) and h is the height (cm). Use the quadratic formula to estimate the time when the height is 6 cm. Round your answer to the nearest second.
A. 21 sec B. 20 sec C. 18 sec D. 14 sec
Identify the equation as either an identity or not.sin 
cos 
= 
A. Not an identity B. Identity
Factor the trinomial by grouping, or state that the trinomial is prime.7x2 - 15xy - 18y2
A. prime B. y(7x + 6)(x - 3) C. (7x + 6y)(x - 3y) D. (7x + 3y)(x - 6y)
Establish the identity.
2 = 1 - sin x
What will be an ideal response?