For 1 play, the chance of gaining $8 is 4/38, while the chance of losing the $1 is 34/38. Therefore, the expected value is ($8)(4/38) + ($-1)(34/38) = $(-1/19). Over 50 plays, which are mutually independent of each other, we multiply the number of plays by the expected value to get $(-50/19) = $-2.63.
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The function of x is equal to 7 dollars times the number of hours the cashier works. This function would look something like this:
F(x) = 7x
Hope this helps! :)
I am better at substitution, but you want to get the equations as similar as possible, but are the opposite, so you can cancel it out.
I think it's answer choice A.
1/2 divided by 3/1
1/2 multiplied by 1/3 (found up-side-down second fraction and opposite operation)
Multiply across. (1*1 and 2*3)
Write as a fraction (1/6).
