31.5749...9...9....9....9....
Answer:
Step-by-step explanation:
To be rational means to be able to express the result as the ratio of two whole numbers.
a) 4/7 + (-1/3) = 12/21 - 7/21 = 5/21 so rational
b) √(4) • 2/5 = ±2 • 2/5 = ±4/5 so both solutions are rational
0.5 that would be half of one if one is greater than the variable M
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The reciprocal means you're just flipping the fraction around,, so it would be 9/10