What is the factor form of 2x^2-25=0 and -4x^2+81=0

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x