The circumference of a circle with radius 10 cm is 62.8 cm. The circumference is proportional to the radius. Find the constant of proportionality in relation to
circumference and radius of the circle.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

In the geometric progression –3, 12, −48… what term is 3,072?

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?