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4 years ago

PLEASE PLEASE PLEASSEEEE HELP ME

Mathematics

2 answers:

Nadya [2.5K]4 years ago

7 0

Answer:

The answer is -8g or 0.33333333

Step-by-step explanation:

-1. -2*3g= -6g

-2. -2*1= -2

-3. -6g+-2= -8g

The statement -7 is wrong!!!

Unless this is 2-step equation then 

-1. -2*3g= -6g

-2. -2*1= -2

-3. -6g+-2=-7

4. Keep the variables on one side and the numbers on the other and when switching make sure to use the opposite expression.

5. -6g=-7+2= -6g=-5

6. Divide now -6 on both sides = -0.83 ongoing 3's

Alexxx [7]4 years ago

3 0

Answer:

g = 5/6

Step-by-step explanation:

-2(3g + 1) = -7

-6g-2 = -7 (-2×3 , -2×1)

-2+7 = 6g

5 = 6g

5/6 = g

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The U.S. Energy Information Administration (US EIA) reported that the average price for a gallon of regular gasoline is $2.94. T

Anit [1.1K]

Answer:

a) 25

b) 67

c) 97

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample. In this problem, $\sigma = 0.25$

(a) The desired margin of error is $0.10.

This is n when M = 0.1. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.1 = 1.96*\frac{0.25}{\sqrt{n}}$

$0.1\sqrt{n} = 1.96*0.25$

$\sqrt{n} = \frac{19.6*0.25}{0.1}$

$(\sqrt{n})^{2} = (\frac{19.6*0.25}{0.1})^{2}$

$n = 24.01$

Rounding up to the nearest whole number, 25.

(b) The desired margin of error is $0.06.

This is n when M = 0.06. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.06 = 1.96*\frac{0.25}{\sqrt{n}}$

$0.06\sqrt{n} = 1.96*0.25$

$\sqrt{n} = \frac{19.6*0.25}{0.06}$

$(\sqrt{n})^{2} = (\frac{19.6*0.25}{0.06})^{2}$

$n = 66.7$

Rounding up, 67

(c) The desired margin of error is $0.05.

This is n when M = 0.05. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.05 = 1.96*\frac{0.25}{\sqrt{n}}$

$0.05\sqrt{n} = 1.96*0.25$

$\sqrt{n} = \frac{19.6*0.25}{0.05}$

$(\sqrt{n})^{2} = (\frac{19.6*0.25}{0.05})^{2}$

$n = 96.04$

Rounding up, 97

8 0

3 years ago

Can someone please help me with this math question

lora16 [44]

Answer:

C'(4,4)

Step-by-step explanation:

The dilation of quadrilateral ABCD over the origin by a scale factor of 2 has the rule

(x,y)→(2x,2y)

So,

A(-3,-1)→A'(-6,-2)
B(-1,1)→B'(-2,2)
C(2,2)→C'(4,4)
D(3,-2)→D'(6,-4)

Hence, the coordinates of the image point C' are (4,4) (see attached diagram for details)

8 0

4 years ago

Read 2 more answers

Need help ASAP i dont understand this someone help

jek_recluse [69]

Answer:

x=2

Step-by-step explanation:

Dilation of 3

6/3=2

6 0

3 years ago

Please and thank you

makkiz [27]

Answer:

that answer is A i 'm sorry

7 0

3 years ago

Read 2 more answers

give an example of a problem that could be solved using the expression 9.5 x (8 + 12.5).solve your problem.

dimulka [17.4K]

Make a word problem... I think.
Janie needs to knit 5 shirts. Maddy needs to make 12.5 shirts.They need to do this every day for 9.5 days. How many shirts in total (Maddy and Janie combined) do they make by the end of the 9.5 days?

Answer:
9.5 x (8 + 12.5)
9.5 x 20.5194.75 shirts in total

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5 0

3 years ago

PLEASE PLEASE PLEASSEEEE HELP ME​

PLEASE PLEASE PLEASSEEEE HELP ME