Triangle abc a(-3,1) b(1,3) c(2,-4) . move point c so that the triangle becomes right angle. is there a methods apart from guess and check?

Write the equation in general quadratic form: plz !

Find the unit rate. enter your answer as a mixed number. a fertilizer covers 2/3 square foot in 1/2 hour.

Grandpa ernie is shrinking! over the past 4 years his height decreased by a total of 2.4 cm.it decreased by the same amount each year. what was the change in grandpa ernie's height each year