How to solve quadratic functions

A rectangular bedroom has a perimeter of 42 feet. if the length of the bedroom is 11 feet, what is the width of the bedroom?

What is the sum of the angles of an octagon?

Given that M angle KLH equals 120° which statement about the figure must be true?

A simple index of three stocks opens the day with these values: The index rises 3.4% over the course of the day. What is the value of the index at the end of the day? Round your answer to the nearest hundred.

How can i solve u=x-k for x and g=c+x for x

What is the probability that a card picked at random from a 52-card deck of playing cards is a club or a jack?

At 7:00 a. m the temperature was 8 C what was the temperature at midnight if the temp was 10 lower?

Which is a reasonable first step that can be used to solve the equation 2 (x + 6) = 3 (x minus 4) + 5? Combine like terms, 3 and 5, on the right side of the equation. Distribute 2 to (x + 6) and 3 to (x - 4).

A biologist took a count of the number of fish in a particular lake, and recounted the lake's population of fish on each of the next six weeks. Find a quadratic function that models the data as a function of x, the number of weeks.

Are 9 (4-x) and 36+9x equivalent expressions