To fill a 10 gallon tank exactly halfway you'll need 5 gallons of fuel. Each fuel can holds 1 gallons so:

cans = \( \frac{5 \text{ gallons}}{1 \text{ gallons}} \) = 5

To multiply terms with exponents, the base of both exponents must be the same. In this case they are so multiply the coefficients and add the exponents:

-5x³ x 9x⁴
(-5 x 9)x^{(3 + 4)}
-45x⁷

The factors of a number are all positive integers that divide evenly into the number. The factors of 40 are 1, 2, 4, 5, 8, 10, 20, 40.

If the tiger has consumed 20 pounds of food in 4 days that's \( \frac{20}{4} \) = 5 pounds of food per day. The tiger needs to consume 50 - 20 = 30 more pounds of food to reach 50 pounds total. At 5 pounds of food per day that's \( \frac{30}{5} \) = 6 more days.

By buying two shirts, Monty will save $11 x \( \frac{15}{100} \) = \( \frac{$11 x 15}{100} \) = \( \frac{$165}{100} \) = $1.65 on the second shirt.

So, his total cost will be
$11.00 + ($11.00 - $1.65)
$11.00 + $9.35
$20.35