Write in ordinary form : 6 x 10^-4

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.