Scientific Notation (Please help!)

Write in standard form:
6.79 x 10⁻⁴

If the alternate hypothesis of an experiment is “the true mean height of the giraffes is more than 15 feet” what is the null hypothesis?

If the equation of a line containing the midsegment of a triangle is y = -1/4x -11, what is the slope of the triangle side that is opposite the midsegment (the one not touching it). explain how you know.

Henrik is shopping at a store. the store is having a sale on all items. henrik also has a coupon for an additional amount off the sale price. the expression 0.7p – 15 represents the final price, in dollars, of items with a regular price of p dollars. complete the table by filling in the value of the coupon and the percent discount of the store's sale.