If someone could help me AS SOON AS POSSIBLE!

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?