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If the tiger has consumed 91 pounds of food in 7 days that's \( \frac{91}{7} \) = 13 pounds of food per day. The tiger needs to consume 156 - 91 = 65 more pounds of food to reach 156 pounds total. At 13 pounds of food per day that's \( \frac{65}{13} \) = 5 more days.

A number in scientific notation has the format 0.000 x 10^exponent. To convert to scientific notation, move the decimal point to the right or the left until the number is a decimal between 1 and 10. The exponent of the 10 is the number of places you moved the decimal point and is positive if you moved the decimal point to the left and negative if you moved it to the right:

0.0009909 in scientific notation is 9.909 x 10^-4

To divide fractions, invert the second fraction and then multiply:

\( \frac{4}{9} \) ÷ \( \frac{3}{5} \) = \( \frac{4}{9} \) x \( \frac{5}{3} \)

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{4}{9} \) x \( \frac{5}{3} \) = \( \frac{4 x 5}{9 x 3} \) = \( \frac{20}{27} \) = \(\frac{20}{27}\)

To multiply fractions, multiply the numerators together and then multiply the denominators together:

\( \frac{4}{7} \) x \( \frac{4}{7} \) = \( \frac{4 x 4}{7 x 7} \) = \( \frac{16}{49} \) = \(\frac{16}{49}\)