Helen wrote and solved the equation. x minus 17 = 56. x minus 17 + 17 = 56 minus 17. x = 39. What was Helen’s error?
a. Helen only needed to add 17 to the left side of the equation.
b. Helen should have added 17 to both sides of the equation.
c. Helen’s work is correct.
d. Helen made a subtraction error when subtracting 17 from 56.

Adriveway is 40 yards long about how many meters long is it

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Which geometric principle is used to justify the construction below?