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3 years ago

Twice the difference of a number and 6 is equal to three times the sum of the number and 9. Find the number

Mathematics

1 answer:

stealth61 [152]3 years ago

7 0

Answer:

the number is -39

Step-by-step explanation:

2(n-6)=3(n+9)

2n-12=3n+27

-2n -2n

-12=n+27

-27 -27

-39=n

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A submarine dives 320 feet below the water's surface. Over the next six

sergeinik [125]

Answer:

Explanation:

Since it rises at a rate of 40 feet per minute, just multiply 40 times 6 to get 240. Then subtract 320 minus 240 to get 80

3 0

3 years ago

A pizzeria uses a 3-pound bag of cheese to make 8 pizzas. Use a given ratio to find how many pounds of cheese the pizzeria needs

MatroZZZ [7]

3 pounds of cheese to 8 pizzas.

3:8

We know the 60 pizzas. Let the cheese= c.

c:60

60/8= 7.5

3*7.5= 22.5

22.5:60

c= 22.5 pounds of cheese.

I hope this helps!
~kaikers

4 0

3 years ago

Read 2 more answers

There are 300 welders employed at Maine Shipyards Corporation. A sample of 30 welders revealed that 18 graduated from a register

zmey [24]

Answer: (0.4247,0.7753)

Step-by-step explanation:

Given : Sample size : n=30

Number of people graduated from a registered welding course =18

The probability of people graduated from a registered welding course : $p=\dfrac{18}{30}=0.6$

Significance level : $\alpha:1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

A confidence interval for population proportion is given by :-

$p \pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}\\\\=0.6\pm(1.96)\sqrt{\dfrac{0.6(1-0.6)}{30}}\\\\\approx0.6\pm0.1753\\\\=(0.4247,0.7753)$

Hence, the 95 percent confidence interval for the proportion of all welders who graduated from a registered welding course = (0.4247,0.7753)

5 0

3 years ago

Madison wants to make cookies for her little sisters birthday party. She is cutting a roll of cookie dough into pieces that are

e-lub [12.9K]

Given is : Madison wants to make cookies for her little sisters birthday party. She is cutting a roll of cookie dough into pieces that are 1/2 inch thick

The thickness of the roll of cookie dough is = $\frac{1}{2}=0.5$ inches

Thickness of the complete roll = 13 inches

Number of cookies that can be cut are = $\frac{13}{0.5}$ = 26

Hence, Madison can cut/make 26 cookies from the roll.

6 0

3 years ago

Barbara D'Angelo is 40 years old. She wants to purchase an $80,000, 5-year term life insurance policy. What is her annual premiu

Serjik [45]

Number of thousands on 80000
80000/1000=80
So her annual premium
3.47×80=277.6

Hope it helps

4 0

3 years ago