Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y

Diego is measuring sugar to bake cookies. He needs3/4 cups and he has 1/4 now. how much more does he need explain how you know

In a group of 42 children there are twice as many boys as girls. How many girls are there?

9. To order books from an online site, the buyer must open an account. The buyer needs a username and a password. a. If the username needs to be eight letters, how many different usernames are possible: i. If the letters can be repeated? ii.

2/1:1/4 do you know the answer

What are the basic prime numbers

Write the fraction in simplest form 25/100

A store has apples on sale for $5.00 for 2 pounds. If an apple is approximately 5 ounces, how many apples can you buy for $30.00? Complete the explanation. The cost per pound of the apples on sale is $. You can buy pounds of apples for $30.00.

What is the exact solutions of x2=5x+2

Which expression represents a negative number? a. 0.25 2.7 b.-0.25 2.7 c.-2.7 (-0.25) d.-0.25 (-2.7)

What is the factorization of the expression below? 4x2-9y2