How to simplify 1 over 10 times 4 over 10

What would happen to the sum of a geometric series if the ratio was 1?

Jeremy is practicing some tricks on his skateboard. One trick takes him forwards 4 feet, then he flips around and moves backwards 7.6 feet, then he moves forward again for 3.6 feet.

A mason wants to start building a stone pyramid the base of which has 551 blocks and the top 26th layer has only 1. If the number of blocks on each layer follow an arithmetic sequence, how many blocks should he get?

A pilot is flying an airplane at an elevation of 17,500 feet. She is increasing her elevation at a rate of 2,500 feet per minute.

Last years average ticket price was £22 this year the average ticket price has increased by 5% what is the average price now

A broker has a four-year contract to manage a rental unit for an investor. He is to receive 50% of the first month's rent and 5% of each remaining month. The rent is $600/month. How much will the broker earn over the term of the contract?

A line that is parallel to the graph of y=1/2+6 with a y-intercept of (0,-2)

The sum of two numbers is 49. One number is 35 more than the other. find the two numbers

Eugene stands 8 feet from a wall where his family portrait is hanging. Eugene's eye height is 5 feet above the floor and the angle of elevation from his eyes to the top of the portrait is 46. How far above the floor is the top of the portrait?

Jane took a survey at school and found that 3 of the students surveyed planned to take wood shop as their next elective, while 9 of them planned to take other electives.