2 years ago

What is the expected value of X

Mathematics

1 answer:

ehidna [41]2 years ago

4 0

Answer:

sorry I don't know about this Question

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Six times a number is 45 greater than the product of the number and -3. Find the number.

LiRa [457]

Answer:

Step-by-step explanation:

6a = (a*-3) + 45

then:

6a = -3a + 45

6a + 3a = 45

9a = 45

a = 45/9

a = 5

Check:

6*5 = (5*-3) + 45

30 = -15 + 45

8 0

2 years ago

How do I do number 4?

Galina-37 [17]

What are you trying to find?

4 0

2 years ago

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Lee is thinking of two Numbers,the product is 18. the quotient is 2

defon

X, y - the numbers

The product is 18.
$xy=18$

The quotient is 2.
$\frac{x}{y}=2 \ \ \ |\times y \\
x=2y$

Substitute 2y for x in the 1st equation:
$2y \times y=18 \\
2y^2=18 \ \ \ |\div 2 \\
y^2=9 \\
y=\pm \sqrt{9} \\
y=3 \ \lor \ y=-3 \\ \\
x=2y \\
x=2 \times 3 \ \lor \ x=2 \times (-3) \\
x=6 \ \lor \ x=-6 \\ \\
(x,y)=(6,3) \hbox{ or } (x,y)=(-6,-3)$

The numbers are 6 and 3 or -6 and -3.

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2 years ago

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A certain rectangle is 5 times as long as it is wide. Suppose the length and width are both tripled. The perimeter of the second

astraxan [27]

It is tripled as well. You are tripling every distance and thus tripling the sum of the distances as well.

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3 years ago

Stella wants to buy a remote control helicopter. The one she wants costs $120.

aalyn [17]

.45 * 120 = 54

.072 * 54 = 3.888