What is the value of cos (infinity) ? Can someone explain this one for me?

Use slopes and y-intercepts to determine if the lines y=5x+5 and 5x-y=-5 are parallel.

Alexa earns $33,000 in her first year of teaching and earns a 4% increase in each successive year. Write a geometric series formula, Sn, for Alexa's total earnings over n years.

In the united states, the average salary of a professional basketball player is about $5.15 * 10^6, while the national average salary is about $42,980.

In the early months of some year once I added 0.5 million new accounts every day at this rate how many days would be needed to add 30 million new accounts

X+y+z=-13 2x+5y+2z=-41 -x+8y-3z=-22

What is 7/27 simplified?

The classroom has 4 desks in each row. There are 5 rows. How many desks are there in the classroom

How many different four digit numbers can you make with these?

Enter the sentence as an equation "three increased by twice a number is at least - 7"

How many cups of walnuts are needed to make 3.75 batches of muffins? One batch of walnut muffins uses 1.33