Atotal of $4.80 consisting of dimes and quarters was collected from a soft drink vending machine. if there's one more quarter than there are dimes, find the number of dimes and the number of quarters.
a. 18 dimes; 12 quarters
b. 12 dimes; 13 quarters
c. 13 dimes; 14 quarters
d. 14 dimes; 15 quarters

How do you use the elimination method for this question? explain, because i really want to understand!

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?

What is the equation of the parabola with focus (-1,-1) and directrix y=1?