Answer:

Step-by-step explanation:
Pythagorean Theorem

To find 50 percent, you multiply the number by 0.5 (for 30%, 0.3 etc.).
42.88 * 0.5 = 21.44
Answer:
4800 inches
Step-by-step explanation:
To expand, you just take the 5 and multiple by each individual factor.
10 x 5x + 5y x 10
Answer:
B) 47.5%
Step-by-step explanation:
Refer to the normal distribution chart attached. If 130 is 2 standard deviations higher than the mean (ignore the numbers beneath the percentages), then by the empirical rule, this means that 34%+13.5%=47.5% of adults are between IQs of 100 and 130. Therefore, option B is correct.