What score represents 2.5 standard deviations below the mean? Mean is 980 and deviation is 100

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

What is the y-intercept of the line given by the equation

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank