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nata0808 [166]
3 years ago
11

How do you find the value of x in the equation y= 2x+4 when y=18

Mathematics
2 answers:
masya89 [10]3 years ago
8 0

Answer:

7

Step-by-step explanation:

18=2x+4

-4       -4

14=2x

÷2  ÷2

7=x

x=7

Mazyrski [523]3 years ago
5 0

Answer:

X=7

Step-by-step explanation:

since y=18 look at the problem "2x+4" 7×2 is 14, 14+4=18 therefore, x is 7.

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Every piece of chicken costs $1.00.
abruzzese [7]

Answer:

5

Step-by-step explanation:

because if each piece of chicken is 1 dollar she would just have to multiply 1×5

4 0
3 years ago
Melvin and Frank caught a lizard in their backyard. Its body is 178 long, and its tail
damaskus [11]

Answer:

286 cm.

Step-by-step explanation:

You add up the two sections, since it is implied that there are no intersection between the two lengths.

178 + 108 = 286 cm.

3 0
3 years ago
We are studying the proportion of cities that have private garbage collector. We want a maximum error of 0.10 and a 95% confiden
True [87]

Answer:

The minimum number of cities we need to contact is 96.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence interval 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

Z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

95% confidence interval

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

In this problem, we have that:

p = 0.5, M = 0.1

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.1 = 1.96*\sqrt{\frac{0.5*0.5}{n}}

0.1\sqrt{n} = 0.98

\sqrt{n} = 9.8

(\sqrt{n})^{2} = (9.8)^{2}

n = 96

The minimum number of cities we need to contact is 96.

8 0
3 years ago
Whats the pattern 5,10, 30, 60, 180, ?
jonny [76]
Double the number then triple that number
4 0
3 years ago
How can I find the greatest common factor for number 7?
IRISSAK [1]
The greatest common factor of the number 6 is 1
5 0
3 years ago
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