Atree casts a shadow that is 20 feet long . frank is 6 feet tall, and while standing next to the tree he casts a shadow 4 feet long.

a. how tall is the tree?

b. how much taller is the tree than frank?

How do you find principle and simple interest

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?