How do you write three million, four hundred thousand, seven in numerical form

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Consider the function f(x)=-5x+3 what is f(-2)