Which of the following numbers are written in scientific notation ? a) 0.641×10^3 b) 2×10^1 c) 9.999 ×10^4d) 4.38 ×5^10

5cakes cost 3.50 how much do 7 cakes cost

In the next 10 month, colin wants to save $900 for his vacation. he plans to save $75 each of the first 8 months. how much must he save each of the last 2 months in order to meet his goal if he saves the same amount each month ?

If the equation of a perpendicular bisector of a triangle is y = 2x + 7, what is the slope of the side that it is bisecting? explain how you know.