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1 year ago

Given that 3x – 4y= 22 - Find & when y = -7

Mathematics

1 answer:

Liono4ka [1.6K]1 year ago

6 0

<h2>Answer:</h2>

x=2

<h2><em><u>Step-by-step explanation:</u></em></h2>

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Every ninth person in line at a movie theater gets free popcorn. Every sixth person gets free apple juice. Shani says that the t

pishuonlain [190]

Find the common multiples:

Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48

Multiples of 9: 9, 18, 27, 36, 45

The common multiples are 18 and 36

The first person in line to get both free would be the 18th person and then the 36th person.

So she is correct that the 36th person would get both free, but they wouldn't be the first person to do it.

8 0

2 years ago

The weekly earnings of students in one age group are normally distributed with a standard deviation of 47 dollars. A researcher

ELEN [110]

Answer:

Option D) 340

Step-by-step explanation:

We are given the following in the question:

Alpha, α = 0.05

Population standard deviation, σ = $47

Margin of error = 5

95% Confidence Interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

$\text{Margin of error} = z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

$5 = 1.96(\dfrac{47}{\sqrt{n}} )\\\\\sqrt{n} = \dfrac{47\times 1.96}{5}\\\\n = 339.443776\\\Rightarrow n \approx 340$

Thus, the correct answer is

Option D) 340

7 0

2 years ago

Solve for x.<br><br> 3x - 13 = 2<br><br> (SHOW YOUR WORK)

Eddi Din [679]

3x-13=2

move -13 to the other side

sign changes from -13 to +13

3x-13+13=2+13

3x=2+13

3x=15

divide both sides by 3 to get x by itself

3x/3=15/3

cross out 3 and 3, divide by 3 and then becomes 1*1*x=x

x=15/3

x=5

answer:

x=5

7 0

2 years ago

At the movie theatre, child admission is $5.60 and adult admission is $9.50. On Saturday, four times as many adult tickets as ch

romanna [79]

Answer:

-6.20x-6.20y=-948.6

add this to equation 2

6.20x-6.20x +9.30y-6.20y=1125.30-948.60

3.10y= 176.70

/3.10

y=176.70/3.10

y = 57 number of adult tickets

153-57=96 child tickets

Step-by-step explanation:

child admission is $6.20 : x numbers

adult admission is $9.30 : y numbers

153 tickets were sold

sales of $1125.30 .

x+y = 153.........................1

6.20x+9.30y= 1125.30..............2

4 0

2 years ago

Can someone help me please?

lana [24]

Step-by-step explanation:

#12)

1 5/8= 8x1 = 8 + 5 = 13

13/8 = 13÷8 = 1.625 and it not a repeating decimal

#13)

5/6 = 5 ÷ 6 = 0.833333 and is a repeating decimal

8 0

2 years ago