To subtract these fractions, first find the lowest common multiple of their denominators. The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 10 are [10, 20, 30, 40, 50, 60, 70, 80, 90]. The first few multiples they share are [40, 80] making 40 the smallest multiple 8 and 10 share.

Next, convert the fractions so each denominator equals the lowest common multiple:

\( \frac{5 x 5}{8 x 5} \) - \( \frac{5 x 4}{10 x 4} \)

\( \frac{25}{40} \) - \( \frac{20}{40} \)

Now, because the fractions share a common denominator, you can subtract them:

\( \frac{25 - 20}{40} \) = \( \frac{5}{40} \) = \(\frac{1}{8}\)

Christine scored 86% on the test meaning she earned 86% of the possible points on the test. There were 300 possible points on the test so she earned 300 x 0.86 = 258 points. Each question is worth 3 points so she got \( \frac{258}{3} \) = 86 questions right.

The first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80] and the first few multiples of 10 are [10, 20, 30, 40, 50, 60, 70, 80, 90]. The first few multiples they share are [40, 80] making 40 the smallest multiple 8 and 10 have in common.

If the tiger has consumed 154 pounds of food in 11 days that's \( \frac{154}{11} \) = 14 pounds of food per day. The tiger needs to consume 210 - 154 = 56 more pounds of food to reach 210 pounds total. At 14 pounds of food per day that's \( \frac{56}{14} \) = 4 more days.

A prime number is an integer greater than 1 that has no factors other than 1 and itself. Examples of prime numbers include 2, 3, 5, 7, and 11.