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scZoUnD [109]
2 years ago
9

Solve this quadratic equation using the quadratic formula. x2 + 8x - 5 = 0

Mathematics
1 answer:
jasenka [17]2 years ago
7 0
X^2 + 8x - 5 = 0
a = 1, b = 8, c = -5
x = ( - 8 + - sqrt(64 - 4*1*-5))/2
x = ( -8 + - sqrt(64+20))/2
x = ( -8 + - sqrt (84))/2
x = ( - 8 + - 2sqrt21))/2
x = -4 + - sqrt21
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amm1812
14.125 quarts I believe 
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3 years ago
(21.23) A study of the effect of exposure to color (red or blue) on the ability to solve puzzles used 42 subjects. Half the subj
Cloud [144]

Answer:

There is enough statistical evidence to say that the means are different.

Step-by-step explanation:

<em>The question is incomplete:</em>

<em>"The two-sample t statistic for comparing the population means has value (±0.001)."</em>

<em />

The null and alternative hypothesis are:

H_0: \mu_r-\mu_b=0\\\\H_1: \mu_r-\mu_b\neq0

The level of significance is assumed to be α=0.01.

The difference of the sample means is:

M_d=M_r-M_b=9.64-15.84=-6.20

The standard deviation for the difference of the means is:

s_d=\sqrt\frac{s_r^2+s_b^2}{n} } =\sqrt\frac{3.43^2+8.65^2}{21} }=\sqrt{\frac{85.59}{21} }=\sqrt{4.12} =2.03

Then, the t-statistic is:

t=\frac{M_d-(\mu_r-\mu_b)}{s_d} =\frac{-6.20-0}{2.03}= -3.05

The degrees of freedom are:

df=n_r+n_b-2=21+21-2=40

With 40 degrees of freedom the t-critial for a significance of α=0.01 is t=±2.705.

As the t-statistic lies in the rejection region, the effect is significant and the null hypothesis is rejected.

There is enough statistical evidence to say that the means are different.

7 0
3 years ago
Is x ^ 2 + y ^ 2 = 6 a function?
oee [108]

Answer:

not a function

Step-by-step explanation:

for example

In order for an equation to represent a function any single value of x must have at most one corresponding value of y which satisfies the equation.

For x2+y2=9

XXXXif (for example) x=0

XXXXthere are two values for y (namely +3 and −3) which satisfy the equation

and therefore the equation is not a function.

3 0
2 years ago
Which of the following functions is graphed below?
nikitadnepr [17]

Answer:

non of the above thanks

don't ask me again please

3 0
3 years ago
Read 2 more answers
If you have 9/10 of a pound of granola how many 1/5 pound bags can you fill ?
Lostsunrise [7]

Answer:

4

Step-by-step explanation:

1/5 is the same as 2/10. How many 2's can you put in 9? You can put 4.5 2's in a 9. However, filling half a bag does not fill the entire bag, so the answer would be 4. You can fill 4 full 1/5 pound bags with 9/10 pounds of granola.

3 0
3 years ago
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