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OLEGan [10]
3 years ago
5

Solve 5(2x + 4) = 15. Round to the nearest thousandth.

Mathematics
2 answers:
11Alexandr11 [23.1K]3 years ago
5 0

5(2x + 4) = 15\\10x+20=15\\10x=-5\\x=-\dfrac{5}{10}=-0,5

Stells [14]3 years ago
5 0

Answer:

\huge\boxed{x=-0.5}

Step-by-step explanation:

5(2x+4)=15\qquad\text{divide both sides by 5}\\\\\dfrac{5\!\!\!\!\diagup(2x+4)}{5\!\!\!\!\diagup}=\dfrac{15\!\!\!\!\!\diagup}{5\!\!\!\!\diagup}\\\\2x+4=3\qquad\text{subtract 4 from both sides}\\\\2x+4-4=3-4\\\\2x=-1\qquad\text{divide both sides by 2}\\\\\dfrac{2x}{2}=\dfrac{-1}{2}\\\\\boxed{x=-0.5}

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Suppose that 5% of the time Todd attends a concert twice a month, 40% of the time he attends a concert once a month, and 55% of
nikklg [1K]

Answer:

The expected value for the number of times Todd attends a concert during a month is 0.5.

Step-by-step explanation:

We have these following probabilities:

5% probability of attending a concert twice a month, which means that P(X = 2) = 0.05

40% probability of attending a concert once a month, which means that P(X = 1) = 0.4

55% probability of not attending a concert during the month, which means that P(X = 0) = 0.55

What is the expected value for the number of times Todd attends a concert during a month?

We multiply each value by its probability. So

E(X) = 0.05*2 + 0.4*1 + 0.55*0 = 0.1 + 0.4 = 0.5

The expected value for the number of times Todd attends a concert during a month is 0.5.

7 0
3 years ago
Ellen now has $125. how much would she have after 8 years if she leaves it invested at 8.5% with annual compounding?
liraira [26]

We know the formula for compound interest as

A=P(1+\frac{r}{n})^{nt}

Now, we have been given that Ellen has $125. It means we have

P = $125

From the given directions, we have

r=0.085\\
t=8\\
n=1

On substituting these values in the above mentioned formula, we have

A=125(1+\frac{0.085}{1})^{1\times 8}\\
\\
A=\$240.08

Therefore, Ellen would have $240.08 after 8 years.


3 0
4 years ago
Simplify 0.44 into a fraction​
zmey [24]
The answer would be 11/25
4 0
3 years ago
Alex claims that the product of x^2 and x^4+x^2-1 will be x^8+x^4-x^2. explain the error made by alex
Alekssandra [29.7K]

Answer:

Step-by-step explanation:

the product is a result of multiplication....so lets multiply

x^2 (x^4 + x^2 - 1) =

x^6 + x^4 - x^2

ok...his mistakes are occurring because he is multiplying the exponents when he is supposed to be adding them.

exponent rule : x^a * x^b = x^(a + b)

5 0
3 years ago
Can someone pls help?
garik1379 [7]

Answer:

41

Step-by-step explanation:

4x +5 = 7x -22

5 = 3x -22

27 = 3x

x = 27/3

x = 9

4(9) + 5 = RS

36+ 5 = RS

RS = 41

6 0
3 years ago
Read 2 more answers
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