3 2/5 + ? = 4 how do I solve this problem with addiction of mixed numbers

Factor: 9t^2-16u^2?

Prove the divisibility of the following numbers: 5^23-5^21 by 24

Currently I have 35$ in my savings account. I start saving 45$ every 2 weeks. My friend has 10$ in his account and is saving 16$ every week. How do I write this as an equation.

What is a simpler form of the radical expression? fourth root✓1296x^16y^12

60 minutes is 20% of x minutes

a tank is 1/6 full of gasoline. Of 8 litres are added it would be 1/4 full. how many litres does the tank hold

Theresa is planning on making a fleece blanket for her nephew. She learns the the fabric she wants to use is $7.99 per yard. Find the total cost of 4 yards of fabric. Justify your answer by using the Distributive Property.

What is Szymborska's overall opinion of humanity in "A Contribution to Statistics?" Support your response with at least two details or quotes from the poem.

Write a function rule for the relationship. the amount c of energy you burn and the time t you spend exercising, if you burn Calories at a rate of 12 Cal/min ct = 12 c = 12t t = 12c t = 12/c

Six over 20 divided by 12 over 15