How many permutations exist of the letters a, b, c, d taken two at a time?
a. 12
b. 8
c. 2

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.