Write the equation x^2 - 4x = -12 in standard form

Shania's test scores in 8 subjects were 88, 91, 85, 74, 69, 72, 80, and 87. shania found the middle number of her scores. which type of measure did she find?

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.