What is 5d=470 and what is 8a=47

2 answers:

8 0

5d=470:

in this case we have to divide both sides by 5:

d=94

8a=47:

in this case we have to divide both sides by 8:

a=5.875

as a general rule, if you want to find out a value of a in
ab=c

you have to divide both sides of the equation by b (if it's not zero); then you will have left:

a=c/b

and if you calculate c/b, this will give you the answer

Gre4nikov [31]3 years ago

5 0

$5d= 470 \\ \\ d=470:5 \\ \\ \boxed{\boxed{d= 94}} \\ \\ 8a=47 \\ \\ a=47:8 \\ \\ \boxed{\boxed{a=5.875}}$

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you are rolling a 10-sided die with sides numbered 1-10. you keep rolling the die until you roll a prime number and then stop. l

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Prime numbers between 1-10 = 2,3,5,7 (4 prime numbers)

Non - prime numbers = 1,4,6,8,9,10( 6 non-prime number)

Let X be the number of times the die is rolled

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$P(Prime) = \frac{4}{10}$

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E(X)=∑x.P(x) [ x-> {1, infinity}]

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= 1. $\frac{4}{10}$ + 2. $\frac{6}{10}$ . $\frac{4}{10}$ + 3. $\frac{6}{10}$ . $\frac{6}{10}$ $\frac{4}{10}$ + 4. $\frac{6}{10}$ . $\frac{6}{10}$ . $\frac{6}{10}$ . $\frac{4}{10}$ .......