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3 years ago

Can anyone help me on these 2 questions

Mathematics

2 answers:

erica [24]3 years ago

6 0

Answer:

Nope lol

Step-by-step explanation:

horsena [70]3 years ago

3 0

A) So to find f(2) this means x=2, and you’re looking for y. On the graph, where x=2, y=3.
This means f(2)=3

b) To find f(x)=0, find where y=0. y=0 at x=5, and y=0 at x=-5.

Hope this makes sense!! If you have any more questions, let me know on the comments.

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Is Y=7.5x proportional or non proportional

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Hi , the answer is proportional , every time when you see an equation that has the Y first then a number next to a x , that equation tells you that there is a proportional relationship.
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3 years ago

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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>

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3 years ago

Midterm plss helpppppp

jasenka [17]

Answer:

we conclude that:

$g\left(x\right)\:-\:h\left(x\right)\:=\:2x^2\:-\:3x$

Step-by-step explanation:

Given

$h(x) = -3x$

$g\left(x\right)\:=\:2x^2$

We have to determine $g\left(x\right)\:-\:h\left(x\right)\:=\:2x^2\:-\:3x$

$g\left(x\right)\:-\:h\left(x\right)\:=\:2x^2\:-\:3x$

Thus we conclude that:

$g\left(x\right)\:-\:h\left(x\right)\:=\:2x^2\:-\:3x$

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3 years ago

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Answer:

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3 years ago

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If the numerator of a fraction is increased by six, the value of the fraction will increase by one. If the denominator of the or

Alchen [17]

Answer:

$\dfrac{7}{6}$

Step-by-step explanation:

Let $\dfrac{a}{b}$ be the original fraction.

If the numerator of a fraction is increased by six, the value of the fraction will increase by one. Hence,

$\dfrac{a+6}{b}=\dfrac{a}{b}+1$

If the denominator of the original fraction is increased by 36, the value of the original fraction will decrease by one. Hence,

$\dfrac{a}{b+36}=\dfrac{a}{b}-1$

Add these two equalities:

$\dfrac{a+6}{b}+\dfrac{a}{b+36}=\dfrac{a}{b}+1+\dfrac{a}{b}-1\\ \\\dfrac{a+6}{b}+\dfrac{a}{b+36}=2\dfrac{a}{b}\\ \\\dfrac{a}{b+36}=\dfrac{2a-(a+6)}{b}\\ \\\dfrac{a}{b+36}=\dfrac{a-6}{b}\\ \\ab=(a-6)(b+36)\\ \\ab=ab+36a-6b-216\\ \\36a-6b-216=0\\ \\6a-b-36=0\\ \\b=6a-36$

Substitute it into the first equation:

$\dfrac{a+6}{6a-36}=\dfrac{a}{6a-36}+1\\ \\\dfrac{a+6}{6(a-6)}=\dfrac{a}{6(a-6)}+1\\ \\a+6=a+6(a-6)\\ \\a+6=a+6a-36\\ \\6a=6+36\\ \\6a=42\\ \\a=7\\ \\b=6\cdot 7-36=42-36=6$

Thus, the initial fraction was

$\dfrac{7}{6}$

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4 years ago