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Masteriza [31]
3 years ago
15

Equation of elimination method 4a+b=28 a+4b=-8

Mathematics
1 answer:
Vilka [71]3 years ago
6 0
Download an app called Photomath then it will answer it for you with work and explaining
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The mean life of a particular brand of light bulb is 1200 hours. if you know that at about 95% of this brand of bulbs will last
Snowcat [4.5K]
<span>204
   First, lookup a standard normal table and see what the z-score is for 0.025 (one half of 100% - 95%) to allow for equal sized tails. You should find that the z-score is 1.96. That means that 95% of the time, the value should be within 1.96 standard deviations of the mean. Now let's calculate the standard deviation. 800 is 800 - 1200 = -400 to the left of the mean of 1200. 1600 is 1600 - 1200 = 400 to the right of the mean of 1200. So we are an equal distance of 400 on both sides of the mean. And we know from the z-score of 1.96, that we're 1.96 standard deviations from the mean. So a little division will give us the standard deviation. Which is: 400 / 1.96 = 204.0816327
   So the standard deviation of the light bulbs is 204</span>
4 0
3 years ago
D Cuales son cángulos agudo<br>?​
nasty-shy [4]

Ángulo agudo es aquel que mide menos de 90º

6 0
2 years ago
What is the probability of drawing a 9 of spades from a 52-card deck given the deck is properly shuffled?
avanturin [10]
1.923% (Roughly)

You can get this by dividing 1 by 52 to find the likelihood. <span />
4 0
3 years ago
Jim
stealth61 [152]

yes i agree because if all the integers are positive, the answer stays positive which means if you know your integer rules: a positive divide by a positive it stays positive. its the same thing for all the other operations. hope this helps.

6 0
3 years ago
Read 2 more answers
What the answer to this
Blababa [14]
I am pretty sure the answer is A because the graph is a cubic function
5 0
3 years ago
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