If x>7, what is one number that x could be?

How many grams must be adde to 970g to make 1 and a half kg

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Ined this is due tomorrow and i dont know the answer can you find all the exponents