15 - a = - 27 what is a?

How do we do order of operations

Derek's favorite clothing store is having their annual fall sale. All clothing is 25 percent off. A shirt he really likes has an original price of $28. Derek has $24 in his wallet.

Give example of a function f: N-> N which is: (a) injective but not surjective. (b) surjective but not injective. (c) bijective but not identity function.

Science textbooks are ordered every 10 years math textbooks are ordered every 5 years if new science and math textbooks were ordered on the same year in 2008 how many years will pass for the textbooks be ordered together?

Today, a bicycle rider rode her bike 5 1/2 miles. Yesterday, she rode 6 miles. What fraction of the total of the two rides is the longer ride?

5. Andre is solving the equation 4 (x + 3) = 7. He says, "I can subtract from each side to get 4x = 1 and then divide by 4 to get x = " Kiran says, "I think you made a mistake." a. How can Kiran know for sure that Andre's solution is incorrect? b.

On three examinations, Dana received scores of 84, 89, and 78. What score does Dana need on the fourth examination to raise his average to 85?

You have a Spanish meeting every forth day and a math club meeting every tenth day. Today you have both meetings. In how many days will you have both meetings on the same day again?

5.2 turned into a fraction in simplest form.

A certain laptop is really popular and sells for $199.99. Since sales are so good, the store raises the price by 13%. What is the cost of the laptop after the markup?