Martha earns $12.47 per hour. john makes 3 times as much as martha. how much does john earn per hour? a.$36.00 b.$37.21 c.$37.41 d.$36.41 me asap

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Given abcd ac=38 and ae=3x+4 find the value of x

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.