What is -10 subtracted -9 plus 18 equals?

How do you answer the question . Number of pencils equals number of boxes how many pencils in 18 boxes? What is the purpose of an HIM apex? An anonymous Psalm is by an unknown writer? Why does 5 plus 5 not equal 11? Convert 37.4 c to f? What are all the possible number combinations to make 4 digit even numbers for 7 5 4 and 8? What is the unit digit of 4? What is the square root of 864 simplified? When is it correct to use a th after a date and does it matter if it is for a formal letter or informal writing? How does geometric growth rate differs from an arithmetic growth rate? What symbolizes uniform? How many street blocks equals to 500 feet? How much is an iphoni 5? Does reflection happens when two plane mirrors are placed right angled to each other? How much money is 3 M? What is -3 to the third power equal? What does 28 percent of 2700.00 equal? What is 3542 rounded to the nearest hundred? Can 2 go into 34? Why was pi found?