All categories

3 years ago

What is the solution to this equation? X+ 15 = 28

Mathematics

2 answers:

vampirchik [111]3 years ago

6 0

Answer:

x = 13

Step-by-step explanation:

Given

x + 15 = 28

Isolate x on the left side by subtracting 15 from both sides

x = 28 - 15 = 13

xxMikexx [17]3 years ago

3 0

To solve this equation, just flip it around and change addition to subtraction.

So it would go from x + 15 = 28
To 28 - 15 = x
And 28 minus 15 equals 13
So x = 13
Then you plug 13 in for x.
13 + 15 = 28.

You might be interested in

Perform the following calculations. In each case, first estimate the solution without using a calculator and then do the calcula

kakasveta [241]

Answer:

For a: The answer is $2.3\times 10^1$

For b: The answer is $8.0\times 10^{-6}$

For c: The answer is 127.6

For d: The answer is $4.66\times 10^4$

Step-by-step explanation:

Significant figures are defined as the figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

Rules for significant figures:

Digits from 1 to 9 are always significant and have infinite number of significant figures.
All non-zero numbers are always significant. For example: 654, 6.54 and 65.4 all have three significant figures.
All zero’s between integers are always significant. For example: 5005, 5.005 and 50.05 all have four significant figures.
All zero’s preceding the first integers are never significant. For example: 0.0078 has two significant figures.
All zero’s after the decimal point are always significant. For example: 4.500, 45.00 and 450.0 all have four significant figures.
All zeroes used solely for spacing the decimal point are not significant. For example : 8000 has one significant figure.

Rule applied for the addition and subtraction is:

The least precise number present after the decimal point determines the number of significant figures in the answer.

Rule applied for the multiplication and division is:

The number of significant digits is taken from the value which has least precise significant digits.

For the given options:

Option a: (2.7)(8.632)

The given problem is a multiplication one.

$\Rightarrow (2.7\times 8.632)=23.3$

Here, the least precise significant digits are 2. So, the answer is $2.3\times 10^1$

Option b: (3.600 x 10^-4) / 45

The given problem is a division one.

$\Rightarrow \frac{(3.600\times 10^{-4})}{45}=0.08\times 10^{-4}$

Here, the least precise significant digits are 2. So, the answer is $8.0\times 10^{-6}$

Option c: 2.365 + 125.2

The given problem is an addition one.

$\Rightarrow (2.365+125.2)=127.565$

Here, the least precise significant digits after decimal is 1. So, the answer is 127.6

Option d: (4.753 x 10^4) - (9 x 10^2)

The given problem is a subtraction one.

$\Rightarrow (4.753\times 10^4)-(9\times 10^2)=(4.753\times 10^4)-(0.09\times 10^4)=4.663\times 10^4$

Here, the least precise significant digits after decimal are 2. So, the answer is $4.66\times 10^4$

3 0

4 years ago

A swimming pool had 2.5 million liters of water in it. Some water evaporated, and then the pool only had 2 million liters of wat

shepuryov [24]

Original volume = 2.5 million liters.
After evaporation, the remaining volume is 2 million liters, therefore
Evaporated volume = 2.5 - 2 = 0.5 million liters.

Percent of water evaporated = 100*(0.5/2.5) = 20%

Answer: 20%

6 0

4 years ago

Determine whether the following events are mutually exclusive. Choosing a student who is a mathematics major or a chemistry majo

dem82 [27]

Answer:

The events are mutually exclusive.

Step-by-step explanation:

Mutually exclusive event is simply event where the occurrence of one prevents the occurrence of the other. Better put - a disjointed event.

From the illustration, we have been given an assumption, which is, each student has only one major. As such, we have two independent events:

1. A student who only majors in Mathematics

2. A student who only majors in Chemistry.

The implication is that any student chosen could only possess one major and from the illustration, we could only choose one. It therefore follows that choosing one student major prevents the opportunity to field another student major.

Hence, we say such events are mutually exclusive.

4 0

4 years ago

What is three times a number decreased by 21 is 57 in numberic form

cestrela7 [59]

3x-21=57
3x=21+57
3x=78
Divide by 3
X=26

8 0

4 years ago

I don’t know the equation :(

Serhud [2]

Answer:

me too

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers