What is the answer to 12 plus -7?

What is the meaning item 86? Why do scientists use line graphs? 13 and one third is what in decimal form? What are the 2 days an equinox occurs in a year? What is 9.187 rounded to the nearest tenths place? If two angles of a triangle are acute must the the third angle always be acute? A rectangle has an area of 18 m2 and a perimeter of 18 m What are its length an width? What mountain range is called the back bone of north America? How many inches in 12 and a half feet? How many faces are on the rectangular pyramid? What multiplies to 20 and adds or subtracts to -8? What is the product of prime factors for the number 8918? What is divisble 1912? What is the cubic inches of a round object whose radius is 2 inches by 2 inches height? What is the definition of associtive property? What number is 15 of 80? What is 21 to 36 written in simplest form? What 2 numbers times to make 149? What is 45.52 as a mixed number and that mixed number into its simplest form? What is 6.53 to the nearest whole number?