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1) Twice a number equals 5 times the same number plus 18. Which is the number?
2) If a + b= 29 , b + c = 45, a + c = 44 Find a + b + c = ?
3) Solve the equation: Solve the equation:
(11x - 5)^2 - (10x - 1)^2 −(3x−20)(7x+10)=124

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Use sigma notation to represent the following series for 9 terms.

Calculate the average rate of change over the interval [1, 3] for the following function. f(x)=4(5)^x a. -260 b. 260 c. 240 d. -240