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Firlakuza [10]
3 years ago
11

Priya bought x grams of flour. Clare bought 3/8 more than that.

Mathematics
1 answer:
iris [78.8K]3 years ago
5 0

Answer:

D

Step-by-step explanation:

y=x+3/8x

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Let
Digiron [165]

What I gather from the question is that X has second moment E(X^2)=81 and variance V(X) = 58, and you're asked to find the expectation and variance of the random variable Y=2X+10.

From the given second moment and variance, we find the expectation of X :

V(X) = E(X^2) - E(X)^2 \implies E(X) = \sqrt{E(X^2) - V(X)} = \sqrt{23}

Expectation is linear, so

E(Y) = E(2X+10) = 2 E(X) + 10 = \boxed{2\sqrt{23} + 10}

Using the same variance identity, we have

V(Y) = V(2X+10) = E((2X+10)^2) - E(2X+10)^2

and

E((2X+10)^2) = E(4X^2 + 40X + 100) = 4E(X^2) + 40E(X) + 100 = 424 + 40\sqrt{23}

so that

V(Y) = V(2X+10) = (424 + 40\sqrt{23}) - (2\sqrt{23} + 10)^2 = \boxed{232}

Alternatively, we can use the identity

V(aX+b) = a^2 V(X) \implies V(2X+10) = 4V(X) = 232

5 0
2 years ago
I need help on this question.
Alexxx [7]

m∠STP = 90°


The diagonals inside the square are perpendicular lines, meaning they form 90° angles

4 0
3 years ago
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Which brand of rice is the better buy? Explain your reasoning.
Ad libitum [116K]
So you have to divide the amount by how many you’re buying and get the unit rate per each ounce so the answer is b
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3 years ago
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One gallon of water weighs about 8.34 pounds.<br><br> How much does 3.5 gallons of water weigh?
adelina 88 [10]

Answer:

i'm really smart i scored a on this topic

8.34 * 3 = 25.02

8.34 * 0.5 = 4.17

25.02 + 4.17 = 29.19

Step-by-step explanation:

msg me if u dont understand ill tutor

8 0
2 years ago
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Which of the following fulfills the norms of unemployment definition?
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Answer:

= Available for Work, Seeking for Work, Currently not Working

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3 years ago
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