20 is what percent of 80? Choose the equation to solve the problem

a. 20 = 80% ∙ x; 25%
b. 80 = 20% ∙ x; 400%
c. 20 = x ∙ 80; 25%
d. x = 20% ∙ 80; 0.25%

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)