Question 9 A pharmacist needs 100 gallons of 50% alcohol solution. She only has a 30% solution and an 80%
solution available. How much of the 80% solution should she use?
40 gallons
B
50 gallons
С
70 gallons
D
30 gallons

Anyone know? will mark brainliest if you're correct!

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60