There are 5 posts supporting the guardrail for the steps to your home. The tallest post is 3 feet tall. The heights of each post is 5/8 the height of the next larger post. Write an expression for the height of the shortest post. What is the height of the shortest post?

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

With alll of except for the 2 that i did already

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of