3 years ago

What is the expected sum of the numbers that appear when three fair dice are rolled?

Mathematics

1 answer:

RSB [31]3 years ago

7 0

216 is the right answer I believe

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Answer:

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3 years ago

1. The price decreased from $25.00 to $10.00. Find the percent of decrease.

Aleks [24]

60% decrease

15 is 60% of 25

What is 60% of 25?

Y is 60% of 25

Equation: Y = P% * X

Solving our equation for Y

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Converting percent to decimal:

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3 years ago

Find the missing measurements for the rectangle when the area equals 216 and the perimeter equals 66

kirill [66]

$\bf \stackrel{\textit{perimeter of a rectangle}}{P=2(L+w)}~~ \begin{cases} L=length\\ w=width\\ \cline{1-1} P=66 \end{cases}\implies 66=2(L+w) \\\\\\ 33=L+w\implies \boxed{33-w=L} \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{area of a rectangle}}{A=Lw}\qquad \implies 216=Lw\implies 216=(33-w)w \\\\\\ 216=33w-w^2\implies w^2-33w+216=0 \\\\\\ (w-24)(w-9)=0\implies w= \begin{cases} 24\\ 9 \end{cases}$

now, both values are valid, so if "w" is either one, "L" is the other.

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3 years ago