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3 years ago

How do you solve 3x+7=x

2 answers:

8 0

3x + 7 = x

First, subtract 3x from both sides. / Your problem should look like: 7 = x - 3x
Second, simplify x - 3x to -2x. / Your problem should look like: 7 = -2x
Third, divide both sides by -2. / Your problem should look like: $\frac{7}{-2}$ = x
Fourth, simplify $\frac{7}{-2}$ to $-\frac{7}{2}$ / Your problem should look like: $- \frac{7}{2}$ = x
Fifth, switch sides. / Your problem should look like: x = $-\frac{7}{2}$

Answer as fraction: $-\frac{7}{2}$
Answer as decimal: -3.5

Marizza181 [45]3 years ago

7 0

3x + 7 = x
3x - x = -7
2x = -7
x = - 7/2
x = -3.5

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grin007 [14]

Rounding a number means to change its value slightly so it is not as exact as the original number. Numbers are rounded to a certain place value - tens, hundreds, thousands. etc..

Numbers are rounded to make it easier to do various math processes such as estimating costs in one's head or dividing larger numbers.

RULE: To round a two digit number or higher number to the nearest tens place:

If the number in the ones place of a two digit number is less than five, round the number down to the nearest tens place. If the number in the ones place is greater than five, round it up to the nearest tens plac.

Example 1: Round 23 to the nearest tens place

The number 3 in the ones place is less than five. Therefore the number 23 is rounded down to 20.
23 rounded to the nearest tens place is 20.

Example 2: Round 28 to the nearest tens place.

The number 8 in the ones place is greater than five. Therefore the number 28 is rounded up to 30.
28 rounded to the nearest tens place is 30.

Example 3: Round 94 to the nearest tens place.

The number 4 in ones place is less than five. Therefore the number 94 is rounded down to 90.
94 rounded to the nearest tens place is 90.

Example 4: Round the number 97 to the nearest tens place.

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4 0

3 years ago

Read 2 more answers

What is the solution to this inequality?<br>4(2x + 2) + 12 > 100<br>please help!!

skad [1K]

Subtract 12 from both sides

4(2x + 2) > 100 - 12

Simplify 100 - 12 to 88

4(2x + 2) > 88

Divide both sides by 4

2x + 2 > 88/4

Simplify 88/4 to 22

2x + 2 > 22

Subtract 2 from both sides

2x > 22 - 2

Simplify 22 - 2 to 20

2x > 20

Divide both sides by 2

x > 20/2

Simplify 20/2 to 10

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3 years ago

1. What is the formula for compound interest?

Rus_ich [418]

Answer:

1. CI = P (1 + $\frac{r}{100}$ )^ n - P

CI = A - P

Where P is Principal

R is interest rate

n is number of years

2. a. Semi annually - four times in a year

b. Monthly - two times in a year

c. annually - once in a year

Step-by-step explanation:

1. Money is said to be lent at compound interest , when the interest has become due at certain fixed period say, one year, half year, etc.., is given not paid to money lender, but is added to sum lent . The amount thus obtained become principal for next month and this process repeat until last period .

i.e CI = Final period - Initial period

or CI = A - P

or CI = P(1+ $\frac{r}{100}$ ) ^n - P

2. (a) Semi annually

A = P (1 + $\frac{r}{4 * 100}$ )^ n × 4

(b) Monthly

A = P (1 + $\frac{r}{2 * 100}$ ) ^ n × 2

A = P (1 + $\frac{r}{100}$ ) ^ n

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kicyunya [14]

Answer:

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Step-by-step explanation:

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