In science notation, 670,000,000+700,000,000=?

Consider a collection of pennies with the following constraints: When the pennies are put in groups of 2 there is one penny left over. When they are put in groups of three, five and six there is also one penny left over.

What number is 20% of 625

Which of the following mathematical properties is described by the statement, "whatever is done on one side of the equation must also be done on the other side of the equation"?

Which statement best describes the following situatuion? the more time cassie spends fishing, the more fishes she catches

1) Expand the following expressions (a) 2 (x + 6)

The pH of solution A is 2.4 , while the pH of solution B is 9.4. (a) What are their hydrogen-ion concentrations? (b) How many times greater is the hydrogen-ion concentration of solution A than that of solution B?

Which equation has a variable term in the equation - 6 + 2X = 6x - 9

On may 31, the cash account of bottle's r us had a normal balance of $5,000. during may, the account was debited for a total of $12,200 and credited for a total of $11,500. what was the balance in the cash account at the beginning of may?

When ringing up a customer, a cashier needs 8 seconds to process payment as well as 1 second to scan each item being purchased. If it takes 11 seconds to ring up a customer, how many items are being purchased?

In a chemical compound there are 3 parts zinc for every 16 parts copper by mass a piece of the compound contains 320 grams of copper write and solve an equation to determine the amount of zinc in the chemical compound