What's the GCF of 9 and 15

I answered a question in trigonometry but i need to specifiy what the 1 in 1+cos^2/sin^2 becomes because i "cant assume the reader knows trigonometry"

tami uses square tiles to make an array. she places 5 tiles in each row. she makes 5 rows. how many square tiles does she use?

A rectangular prism has a diagonal of 18.1 cm and its base has a diagonal of 16.2 cm. What is the approximate height of the rectangular prism?

In 2009, Jamaican sprinter usain bolt set a new record by running the 100-meter dash in 9.58 seconds. What is 9.58 written in word form? A. Nine hundred fifty eight B. Nine and fifty eight tenths C. Nine and fifty eight hundredths D.

1/3x-1/2=181/2 What is the value of x

When 6 times a number is increased by 7, the result is 31 what is the number?

3 (3 - 8x) - 1 = - 6x - 28

A bag contains purple marbles and white marbles, 95 in total. The number of purple marbles is 1 less than 5 times the number of white marbles. How many purple marbles are there?

Elena has 12 pieces of banana bread. She gives an equal amount of banana bread to five friends. How many pieces of banana bread does she give each friend?

Order these from least to greatest 3/8 19/24 2/3