Domain and range in the equation f(x)=2x^2+8x+5

Can you me find the missing length. i attached an image.

How can you construct perpendicular lines and prove theorems about perpendicular lines

Answer asap. you begin with 1/2 scoop of ice cream. since you're hungry, you ask the vendor for 2/7 more scoops of ice cream. then, you eat 5/8 scoops. how many scoops of ice cream are left on your cone? i will mark brainliest for first correct answer.