A set of four postcards costs $1.00. Single postcards cost $0.50. What is the least amount of money you can spend to buy exactly 15 postcards?

Select all the correct answers.natalie buys a new car. in the first month, the odometer on the car records 800 miles. from past experience, she expects to drive 900 miles per monthselect all the functions that can be used to find the number of miles, f(n), recorded on the odometer after n months.of(n) = 800n + 100f(n) = 9001 - 100f(n) = 900n + 800(1) = 800; }(n) = f(n - 1) + 900, for n > 2f(1) = 800; 1(n) = f(n − 1) + 100, for n > 2(1) = 900; }(n) = f(n - 1) + 800, for n > 2

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Write the fraction or mixed number and the decimal shown by the model