Solve the logarithmic equation. Round your answer to two decimal places. $${\log }_2(x-1)+{\log }_2(x+2)=3$$

A) $x=9.00$
B) $x=2.70$
C) $x=3.50$
D) $x=0.14$
E) $x=-3.70$

​Solve each of the following for the missing value. Round amounts to the nearest two decimal places.
​
a.127% of 460 = __________
b.__________ of $220 = $9.90
c.33 1/3% of __________ = 117

The Student t distribution looks similar in shape to a standard normal distribution,except it is not as widely spread.

Use a graphing calculator to determine the number of real solutions of the quadratic equation $4x^2-3x+9=0$ .

A) one real solution
B) no real solutions
C) two real solutions

Eco Tech Auto Parts Store, which uses the FIFO method of valuing inventory, has 56 spark plugs remaining in inventory. Eco Tech purchased spark plugs over a three-month period as follows: 32 purchased at $3.87 on January 5, 56 purchased at $4.13 on February 15, and 20 purchased at $2.34 on March 12. Compute the value of the ending inventory of spark plugs at FIFO cost.​