Which equation has a constant of proportionality of 2?

y = 10/5 x

y = 2/2 x

y = 2/4 x

y= 22/2 x

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Under normal conditions, 1.5 feet of snow will melt into 2 inches of water. during a winter season high in the mountains, 301 feet of snow fell. how many inches of water will there be when the snow melts?

When the ball has traveled a distance of