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N76 [4]
3 years ago
8

Where does f(x) = 3x2 – 11x – 4 intersect the x-axis?

Mathematics
2 answers:
AleksandrR [38]3 years ago
7 0

Answer:

f(x) intersect the x-axis ate ( 4 , 0 ) and ( -1/3 , 0)

Step-by-step explanation:

Given function, f(x)=3x^2-11x-4

We need to find this function cuts x-axis at what point.

let, y=3x^2-11x-4

We know that points on x-axis has y-coordinate equal to 0.

So, we put y = 0 to find value of x.

By putting y = 0, we get

0=3x^2-11x-4

3x^2-11x-4=0

solving by quadratic formula,

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

x=\frac{-(-11)\pm\sqrt{(-11)^2-4\times3\times(-4)}}{2\times3}

x=\frac{11\pm\sqrt{121+48}}{6}

x=\frac{11\pm\sqrt{169}}{6}

x=\frac{11\pm13}{6}

x=\frac{11+13}{6}\:\:and\:\:x=\frac{11-13}{6}

x=\frac{24}{6}\:\:and\:\:x=\frac{-2}{6}

x=4\:\:and\:\:x=\frac{-1}{3}

Therefore, f(x) intersect the x-axis ate ( 4 , 0 ) and ( -1/3 , 0)

RideAnS [48]3 years ago
4 0
X= -1/3 (negative x-intercept)
x=4 (positive x-intercept)
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If x and y are odd numbers such that 10<x<y14, what is value of x+y?
wel
I will suppose that your queation is 10<x<y<14
there are only two odd between 10 and 14
which are 11 and 13
since x is smaller than y
x=11 and y=13
there sum will be x+y=11+13=24
5 0
3 years ago
Eddie drank 3/4
ch4aika [34]

Answer:

3/4  x  5  =  15/20

3/5  x  4  =  12/20

15/20 + 12/20 = 27/20

Hope this helps!

6 0
3 years ago
The breaking strengths of cables produced by a certain manufacturer have a mean, u, of 1750 pounds, and a standard deviation of
AlladinOne [14]

Answer:

We accept the null hypothesis that the  breaking strength mean is less and equal to 1750 pounds and has not increased.

Step-by-step explanation:

The null and alternative hypotheses are stated as

H0:  u ≥ 1750   i.e the mean is less and equal to 1750

against the claim

Ha: u > 1750  ( one tailed test)  the mean is greater than 1750

Sample mean = x`= 1754

Population mean = u = 1750

Population deviation= σ = 65 pounds

Sample size= n = 100

Applying the Z test

z= x`- u / σ/ √n

z= 1754- 1750 / 65/ √100

z= 4/6.5

z= 0.6154

The significance level alpha = 0.1

The z - value at 0.1 for one tailed test is ± 1.28

The critical value is z > z∝.

so

0.6154 is < 1.28

We accept the null hypothesis that the  breaking strength mean is less and equal to 1750 pounds and has not increased.

8 0
3 years ago
In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is bell-s
Radda [10]

Answer:

68%

Step-by-step explanation:

The Standard Deviation Rule = Empirical rule formula states that:

68% of data falls within 1 standard deviation from the mean - that means between μ - σ and μ + σ.

95% of data falls within 2 standard deviations from the mean - between μ – 2σ and μ + 2σ.

99.7% of data falls within 3 standard deviations from the mean - between μ - 3σ and μ + 3σ.

From the question,

Step 1

We have to find the number of Standard deviation from the mean. This is represented as x in the formula

μ = Mean = 61

σ = Standard Deviation = 8

For x = 53

μ - xσ

53 = 61 - 8x

8x = 61 - 53

8x = 8

x = 8/8

x = 1

For x = 69

μ + xσ

69 = 61 + 8x

8x = 69 - 61

8x = 8

x = 8/8

x = 1

This falls within 1 standard deviation of the mean where: 68% of data falls within 1 standard deviation from the mean - that means between μ - σ and μ + σ.

Therefore, according to the Standard Deviation Rule, the approximate percentage of daily phone calls numbering between 53 and 69 is 68%

3 0
2 years ago
Please help I cant do it and it is super late
pantera1 [17]
The linear relationship should be
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16 ,17 ,18 ,19 ,20

162,171,180,189,198
WEIGHT
His weight should be going up 9 pounds per birthday
3 0
3 years ago
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