When finding the difference between 2.4 and a number, the answer is 1.57. What number should go in the box to complete the subtraction problem?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Change negative exponents to positive. then solve. round to four decimal places