How do you solve for t in the expression a=p+prt explain

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

What is r i 4.5+10r=-6.5 with work pls

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.