1.x+y=-7 y=x+1 a. substitution method

b. elimination method

2.x-y=-7 x+5y=-7
a. substitution method

b. elimination method​

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

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

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)