9x-4y=15 how do you solve this

Find the overall percent change compared to the original amount: A shirt originally costing $20 is marked with a 15% discount.

Simplify (5rs^-1t^3) (-3r^2st).

Solve the equation - 2 (x - 5) + 6x = 28

Jane borrowed $13,290 at 12.5 percent for 10 years. What was her monthly Payment? Can someone give me the formula for this problem A. 132.90 B. 145.60 C. 194.70 D. 166.13

Megan bought 7 charms for 31.50. Each charm costs the same amount off money. Write an inequality that can be used to determine the maximum amount of charms Megan can buy with 75$.

14kg is equal to many Ib

The number of people arriving for treatment at an emergency room can be modeled by a Poisson process with a rate parameter of four per hour.

The file size of an electronic book is 3.6 megabytes. What is the file size of 18 of these electronic books? 21.6 megabytes 48.6 megabytes 64.8 megabytes D. 71.5 megabytes

Sand has $200. She writes six checks for $19.80 what expression describes the change in her bank account, Also what is her account balance after the checks are cashed?

Farmer bob was counting his cows and chickens and saw that there was 54 legs all together if he had 20 cows and chickens how many of each did he have?