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Alex73 [517]
3 years ago
7

18. Which expression is equivalent to

Mathematics
1 answer:
Amanda [17]3 years ago
6 0

Answer:

D. 14x

Step-by-step explanation:

add 9x to 4x which is 13x then add x to 13x which is 14x

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A light bulb has a lifetime X that is exponentially distributed with a mean 340 hours. Find the probability that the bulb lifeti
LUCKY_DIMON [66]

Answer:

0.7026

Step-by-step explanation:

Let X denote the lifetime of light bulb. Given X \sim Exp(\lambda) where the mean is E(X) = 340 =\frac{1}{\lambda} \implies \lambda = \frac{1}{340} = 0.00294.

Recall that,

\displaystyle P(X>x) = 1 - \int_0^x e^{-\lambda x} = 1 - (1 - e^{-\lambda x} = e^{-\lambda x}

\displaystyle P(X>220 | X>100) = \frac{P(X>220,X>100)}{P(X>100)} = \frac{e^{-\lambda \times 220}}{e^{-\lambda \times 100}} = \frac{0.5236}{0.7452} = 0.7026

7 0
3 years ago
Sandra is showing her work in simplifying (3.3 − 4.2) − 2.8 + 5.7. Identify any error in her work or reasoning. Step 1: (3.3 − 4
julsineya [31]
The answer is correct 
but I think in step 2 that should read the Associative property
8 0
3 years ago
Read 2 more answers
A kitchen wall tile is shaped like a parallelogram. The base of the tile is two times the height of the tile . The height of the
SIZIF [17.4K]

Answer:

12.5 in²

Step-by-step explanation:

Given:

Height of tile = 2.5 in

Base of tile = 2*height of tile = 2*2.5 = 5 in

Length of other side of tile = 2.5 in

Required:

Area of the tile

SOLUTION:

Area of the tile = area of parallelogram

All we need to calculate the area of the tile, is the base and the height.

Area of parallelogram = base × height

Area of tile = 5 × 2.5 = 12.5 in²

5 0
3 years ago
raven plans to increase the price of each item in her store up 10%. which of the following sets of step could raven use to find
user100 [1]
To get the price of the new item after an increase of 10% you would have to find 10% of whatever the price is and add it to the original price so for example say the price is $300 you would do 300*0.10(0.10 is 10%) which is 30 and add that to 300 so the new price would be $330
8 0
3 years ago
Which numbers are irrational? Select all that apply.
ziro4ka [17]

Answer:

\sqrt{18} , \sqrt{78} , and π

Step-by-step explanation:

The irrational numbers are:

\sqrt{18} , \sqrt{78} , and π

8 0
3 years ago
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