Perpendicular lines have slopes that are flipped and have the opposite sign. True or false plz help

How much orange juice do you need to make 2 servings of lemony orange slush?

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.