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3 years ago

If 3 times a certain number is increased by 4 the result is 28 what is the number

Mathematics

2 answers:

Vera_Pavlovna [14]3 years ago

7 0

3x+4=28
-4 -4
3x=24
/3 /3
x=8

EastWind [94]3 years ago

3 0

Answer: The number is 8

Step-by-step explanation:

Let be "x" the certain number. Then "3 times a certain number" means that the number "x" is multiplied by 3. This is:

$(3)(x)=3x$

Now, "3 times a certain number is increased by 4" means that the we must add 4 to $3x$ , in other words, this indicate an addition:

$3x+4$

And finally "3 times a certain number is increased by 4 the result is 28" means that $3x+4$ is equal to 28. Then the expression is:

$3x+4=28$

To find the number "x", subtract 4 from both sides of the equation:

$3x+4-4=28-4$

$3x=24$

Dividing both sides of the equation by 3, you get that the number is:

$\frac{3x}{3}=\frac{24}{3}\\\\x=8$

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rusak2 [61]

Find the area [ a = bh ] of both then subtract.

16 * 20 = 320

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Best of Luck!

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3 years ago

On Julie's trip to the mountains she traveled 192 miles using 6 gallons of gas. On the return trip she traveled 235 miles on 8 g

Tamiku [17]

Julie travelled with 30.5 miler per gallon.

<u>SOLUTION: </u>

Given, On Julie's trip to the mountains she traveled 192 miles using 6 gallons of gas.

On the return trip she traveled 235 miles on 8 gallons of gas.

We have to find how many miles per gallon did Julie get on the way there?

We know that,

$\text { number of miles per gallon }=\frac{\text { total distance travelled }}{\text { total number of gallons }}$

Substituting the values we get,

$=\frac{192+235}{8+6}=\frac{427}{14}=30.5 \text { miles per gallon }$

Hence, Julie travelled with 30.5 miler per gallon on the way there on mountains.

5 0

2 years ago

The circumference of the inner circle is 44 ft. The distance between the inner circle and the outer circle is 3 ft. By how many

Citrus2011 [14]

Answer: 18.86 feet

Step-by-step explanation:

The formula for determining the circumference of a circle is expressed as

Circumference = πD

Where D represents the diameter of the circle.

The circumference of the inner circle is 44 ft. It means that

22/7 × D = 44

22D = 7 × 44 = 308

D = 308/22

D = 14 ft

The distance between the inner circle and the outer circle is 3 ft. This means that the diameter of the outer circle would be

14 + 3 + 3 = 20 ft

Circumference of the outer circle is

22/7 × 20 = 62.86 ft

The number of feet by which the circumference of outer circle is greater than the circumference of the inner circle is

62.86 - 44 = 18.86 feet

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3 years ago

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makvit [3.9K]

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3 years ago

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Kazeer [188]

Answer:

To provide a baseline for judging the survival rates of infants who received whole-body cooling

Step-by-step explanation:

In this case, the purpose of the experiment is to see whether reducing body temperature for three days after birth increased the rate of survival without brain damage.

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If it is not compared to nothing or to a new method, it wouldn't be possible to conclude if the method is better or not than the usual care.

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2 years ago