The sum of two numbers is 45. Three times the first number plus seven times the second is 115. Find the two numbers (show work)

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

Acable company claims that the average household pays $78 a month for a basic cable plan, but it could differ by as much as $20. write an absolute value inequality to determine the range of basic cable plan costs with this cable company. a. |x − 78| ≥ 20 b. |x − 20| ≥ 78 c. |x − 20| ≤ 78 d. |x − 78| ≤ 20