Which condition is sufficient to show that quadrilateral DEFG is a parallelogram?

A. ∠GDE is supplementary to ∠DEF
B. ∠GDE is supplementary to ∠EFG
C. ∠GDE is supplementary to ∠DEF and ∠EFG
D. ∠GDE is supplementary to ∠DEF and ∠FGD

What is the product? (x2+3y+7) [yy+1)

Which is greater, 7 p 5 or 7 c 5? 7p5 7c5

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?