Please show your work for these two problems.

A chemist has a 70 mL beaker of a 40% solution.

a. A equation for the concentration of the solution after addingxmL of pure water.

Concentration= ????

b. Use that equation to determine how many mL of water should be added to obtain a 24% solution. Round your answer to 1 decimal place.

??? mL

The population of a town has been growing, following the equationP=600t+5500, wheretis years after 2010. The number of restaurants in the town has been growing according to the equationR=4t+25.

A equation for the number of restaurants per capita (per person)

Restaurants per capita:????

How many restaurants per capita does this model predict for the year 2017?

????