A scientist wants a 45 milliliter saline solution with a concentration of 11%. She has concentrations of 7% and 19%. How much of each solution must she use to get the desired concentration?

The number 360 is increased by 75 %. The result is then decreased by 50 %. What is the final number

What is negative seven divided by four

What is 3/4+6/8+20/8=

Which equation represents the graph? (y-1) ^2/49-x^2/81=1 (y-1) ^2/7-x^2/9=1

Find the area of the regular 15-gon with radius 5mm

An airline finds that 5% of the persons who make reservations on a certain flight do not show up for the flight.

20 hours put into degrees?

Which should be calculated first to solve this story problem? Marta has had a health club membership for 5 weeks. She goes to the health club 6 times a week. She exercises for 1.5 hours each visit. She spends 0.

An animal shelter houses only dogs and cats. The ratio of cats to dogs at the shelter is 11:9. What is the ratio of the number of dogs to the total number of animals at the shelter?

One student says a decimal can reach one million. The other says it cannot how can he defend his claim.