The intrest of 15000for 4 years is 8100. what is the rate percent per annum

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

The product of 3 and a number increased by 8 is 31 written as an equation

Why does the shape of the distribution of the weights of russet potatoes tend to be symmetrical?