Sonya bought a new candle and wanted to see how long it would take for the candle to burn completely. After having the candle lit for 7 hours, Sonya measured the length to be 34 cm. After 10 hours, the candle was 16 cm
long. How long was the candle when Sonya bought it before she lit it)?

the correct answer is 5

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94

where is the option given

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus