At the souvenir shop, gemstone souvenirs cost $11.60 for 5. which proportion can be used to find the cost of just 1 gemstone?

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

15 point ! ~ see if you know the answer to both you!

Apatient is given 50 mg dose of medicine the medicines effectiveness decreases every hour at a constant rate of 40% what is the exponential decay function that models this scenario how much medicine will be left in the patients system after 2 hours