What should be subtracted from thrice the rational number -5/3 to get 1/2?

If 1/2 is half of 1, what is 1/2 of 2,3, and 4?

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?