Write an equation in slope intercept form for the line with slope -3/2 and y intercept -1

Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)