What is 0.000750 in scientific notation? pls explain how u found the answer

Sammie has 3 times as many goldfish as nora. nora has 4 goldfish. how many goldfish do sammie and nora have in all?

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?

The following data table represents the total cost of a monthly cell phone bill as a function of the number of minutes that the phone is used each month. minutes 500 750 1,000 1,250