Juan made an 80% on his chemistry test. if there were 20 questions, how many questions did juan get correct?

Candy lives in the center of town. her friend darlene lives 28 miles to the east and her friend dana lives 21 miles north. approximately how far do dana and darline live apart ?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Which expression is rational? 6. , square root two, square root 14, square root 49