Find the constant of variation for the relation and use it to write an equation for the statement. Then solve the equation. C.
If y varies directly as x and z, and V =4 when x = 6 and z = 1, find y when x = 7 and 2 - 4
224
7.
y =
3
b.
21
d.
56
2
vez;"(7,4) -

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?