7n - 8t + 6n - 6t combine like terms​

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

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)

What does independent variable and dependent variable mean in math?