Irina has 10 coins, all nickels and dimes, worth a total of $0.70. this is shown by the system of linear equations, x + y = 10 and 0.05x + 0.1y = 0.7, on the graph.
how many nickels does she have?

Analyze the data sets below. data set a 25,25,25,26,26,26,27,28,28,29,30,31,31,32,33,33,34,35,35,35 data set b 25,25,25,26,26,26,26,27,27,27,27,28,28,29,29,30,31,31,32,34 which of the following statement are true? select all that apply. a. data set a is relatively symmetric and data set b is skewed left. b.the means of the data sets are within 3 units from eachother. c.the data sets have the same standard deviation. d.the mean of data set a is 27.95 and the mean of data set b is 30. e. the data set b has a higher standard deviation than data set a. f. the mean and median of data set a are close in value.

Pls! does anybody know a shortcut for answering these types of questions in the future?

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys