Pls answer asap will give brainliest. Upped points as much as possible! For the linear model, y = -67.9x +679, the distance, in miles y, is a function of time, x, in hours. Use the model to calculate the total distance, in miles, at x = 2 hours.

cannot be determined
10 miles
814.8 miles
543.2 miles

How to do this , and can some one explain

Find the values of y: 3y^3(y^2+ 2/3y)=0

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)