The ratio of Maths and science books in a school library is 4:5. If the number of science books is 75, find the number of Maths books? Pls help me​

Use the matrix-column representation of the product to write each column of ab as a linear combination of the columns of a.

If a fair 6 sided cube is rolled 60 times, theoretically how many times should you expect to roll a 4 or a 5?

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.