Show how each of the following equations are the equivilent to 0.9c +1.89r = 17.01
a) c = 18.9 - 2.1r
b) r = 10/21c + 9

can someone plz me

Ineed to know the answer to this algebra question.

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project