In a collection of nickels and dimes the number of dimes is 3 more than twice the number of nickels, If the value of the collection is $1.80, how many dimes are there?

Can someone me with these two circle theorem questions asap?

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Someone answer asap for ! a ball is rolled down a ramp. the height, f(x), in meters, of the ball x seconds after it is released is modeled by the function f(x) = x²- 10x + 25 for all values of x from 0 to 5. which statement about the ball is true? a. the maximum height of the ball is 5 meters b. the height of the ball increases from 0 to 5 meters above the ground. c. the ball has traveled 5 meters when it reaches the bottom of the ramp. d. the ball has been traveling for 5 seconds when it reaches the bottom of the ramp