Kathi starts with a number. She adds 3 to her number, then doubles the result. Finally, she subtracts 7. If she ended with 9, what number did she start with?

8/200 as a decimals

What will the reading on the Richter scale be for an earthquake that has an intensity of 3.8•10^6 and a reference value of 1? A: 1 B: 3.8 C: 5.4 D: 6.6

A formula exists for a monetary return on an investment of continuously compounded interest. If the interest is compounded only once a year, use the following formula. Suppose you have $100 to invest, but started investing only $50.

Your model train has one engine and eight train cars. Find the total number of ways you can arrange the train. (the engine must be first)

Wayne and garth went to the burger barn. the meal cost $24.68. the service was decent, so they left a 15% tip.

Solve the equation x to the 2nd power=0.81 a-none of them b-x=0.9 only! c-x=0.9 or x = - 0.9 d-x = - 0.9 only!

Ally sold 5 oven toasters and 3 rice cookers for $500. If a rice cooker cost $20 less than an over toaster, find the cost of a rice cooker.

Over which interval is the graph of f (x) = -x^2+3x+8 increasing

Does 0.15>0.105 yes or no

22x - y = - 23 (equation 1) 11x + 12y = 1 (equation 2) To find the value of x, you need to substitute in equation 2. The value of x is.