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Sindrei [870]
3 years ago
7

Plz help plz help me

Mathematics
1 answer:
sergeinik [125]3 years ago
3 0

Answer:

A/b

B/d

Step-by-step explanation:

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Solve the following equation for n 18n^2-50=0
Firdavs [7]

18n^2-50=0\ \ \ |+50\\\\18n^2=50\ \ \ |:18\\\\n^2=\dfrac{50}{18}\\\\n^2=\dfrac{50:2}{18:2}\\\\n^2=\dfrac{25}{9}\to n=\pm\sqrt{\dfrac{25}{9}}\\\\n=\pm\dfrac{\sqrt{25}}{\sqrt{9}}\\\\\boxed{n=-\dfrac{5}{3}\ \vee\ n=\dfrac{5}{3}}

Used:\\\sqrt{\dfrac{a}{b}}=\dfrac{\sqrt{a}}{\sqrt{b}}

3 0
3 years ago
A marketing research company desires to know the mean consumption of meat per week among males over age 50. A sample of 217 male
guajiro [1.7K]

Answer: (3.3, 3.5)

Step-by-step explanation:

The formula to calculate the confidence interval is given by :-

\overline{x}\pm z^* \dfrac{\sigma}{\sqrt{n}}

, where \overline{x} = sample mean.

z* = critical value.

\sigma = Population standard deviation.

n= Sample size.

As per given , we have

\overline{x}=3.4

\sigma=0.5

n= 217

By using z-table , the critical value for 95% confidence level : z* = 1.96

Now, the  95% confidence interval for the mean consumption of meat among males over age 50 will be :

3.4\pm (1.96) \dfrac{0.5}{\sqrt{217}}

3.4\pm (1.96) \dfrac{0.5}{14.73091986}

3.4\pm (1.96) 0.0339422

3.4\pm 0.066526712\approx3.4\pm 0.1=(3.4-0.1,\ 3.4+0.1)=(3.3,\ 3.5)

Hence, the 95% confidence interval for the mean consumption of meat among males over age 50 =(3.3, 3.5)

4 0
3 years ago
Solve 4(x - 3) - 2(x - 1) > 0.
Juliette [100K]

Remark

Remove the brackets. Then solve as a normal inequality.

Solution

4(x - 3) - 2(x - 1) > 0

4x - 12 - 2x + 2 > 0    Combine like terms on the left

4x - 2x - 12 + 2 > 0

2x - 10 > 0                 Add 10 to both sides

2x > 10                       Divide by 2

x > 10/2

x > 5

Answer: B

Discussion

C and D are both true but these questions always assume that you are going to pick the lowest value that will allow the inequality  to be true. x> 7 and x>14 will be included in x>5

4 0
3 years ago
Multiply fractions <br><br> 4/7 x 4<br><br> Explain me how to do it plz
yarga [219]

Step-by-step explanation:

Step 1: Multiply the numerators from each fraction by each other (the numbers on top). The result is the numerator of the answer.

Step 2: Multiply the denominators of each fraction by each other (the numbers on the bottom). ...

Step 3: Simplify or reduce the answer.

it's really simple if you still need help tell me

7 0
2 years ago
Nico did 42 push-ups in 3 minutes.<br><br> What is the unit rate?
Scorpion4ik [409]

Answer:

14 per minute

Step-by-step explanation:

42/3 is 14 hope this helps

7 0
2 years ago
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