During the day, sam spent $4.85 on lunch. he also bought 2 books for $7.95 each. at the end of the day, he had $8.20 left. how much money did he start with?

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.