A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.

If the tiger has consumed 49 pounds of food in 7 days that's \( \frac{49}{7} \) = 7 pounds of food per day. The tiger needs to consume 91 - 49 = 42 more pounds of food to reach 91 pounds total. At 7 pounds of food per day that's \( \frac{42}{7} \) = 6 more days.

A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.

To add or subtract terms with exponents, both the base and the exponent must be the same. In this case they are so add the coefficients and retain the base and exponent:

-3a⁵ + 2a⁵
(-3 + 2)a⁵
-a⁵

Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):

3 + (3 + 4) ÷ 2 x 5 - 5²
P: 3 + (7) ÷ 2 x 5 - 5²
E: 3 + 7 ÷ 2 x 5 - 25
MD: 3 + \( \frac{7}{2} \) x 5 - 25
MD: 3 + \( \frac{35}{2} \) - 25
AS: \( \frac{6}{2} \) + \( \frac{35}{2} \) - 25
AS: \( \frac{41}{2} \) - 25
AS: \( \frac{41 - 50}{2} \)
\( \frac{-9}{2} \)
-4\(\frac{1}{2}\)