you have some marbles. when you make a shape of an equilateral triangle, you either have 5 extra, or you need 10 more to complete the shapehow many marbles do you have? how long is one side of your triangle?

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?