Carlos has 42 coins that total $5.10. all of his coins are nickles, n and quaterers, q. which system of equations models this equation

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.

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)