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4 years ago

-3 1/2= 1/2x+1/2x+x A)-1 3/4 B)-5 1/2 C)-1 1/2 10points each

Mathematics

1 answer:

rosijanka [135]4 years ago

4 0

Answer:

-1 3/4 =x

Step-by-step explanation:

-3 1/2= 1/2x+1/2x+x

Combine like terms

-3 1/2 = 2x

Change to an improper fraction

- ( 2*3+1)/2 = 2x

-7/2 = 2x

Multiply each side by 1/2

-7/2 *1/2 = 2x* 1/2

-7/4 = x

Changing to a mixed number

-4/4 -3/4 =x

-1 3/4 =x

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Identify the property’s that justifies the statement: If 4x-3=7, then 4x=10

Alenkasestr [34]

Answer:

Step-by-step explanation:

The equation shown above does not show the substitution property. Instead, it shows the Addition Property of Equation where 3 is added to both of its sides. This is shown below,

4x - 3 = 7

4x - 3 + 3 = 7 + 3

4x = 10

4 0

4 years ago

3/8 = r + 2/3<br> what is R

Kruka [31]

-7/24, because you can just do this question in reverse to figure out an answer. (3/8 - 2/3)

5 0

3 years ago

Read 2 more answers

Last year there were 48 science projects submitted by students at a science fair. This year there are 52 science projects.

Lapatulllka [165]

Answer:

52 - 48 = 4

Around 7%

(Please tell me if this is wrong)

4 0

3 years ago

A mowing company charges $840 plus $17 per hour. Another moving company charges $760 plus $22 per hour. How long is a job that c

Korvikt [17]

Answer: 16 hours

Step-by-step explanation:

The two equations are:

840 + 17x

and

760 + 22x

with x being the amount of hours

840 + 17x = 760 + 22x

-760

80 + 17x = 22x

-17x

80 = 5x

16 = x

840 + 17(16) = 1,112

760 + 22(16) = 1,112

3 0

3 years ago

Cheryl solved a problem: 84 ÷ 0.01 = 8,400.

Alexandra [31]

Answer:

Cheryl is correct.

Step-by-step explanation:

Cheryl solved a problem : 84 ÷ 0.01 = 8,400.

This is absolutely right.

When we divide any whole number with the divisor having decimal, we change the divisor to a whole number before performing the division.

To do this, we multiply both the numbers (divisor and dividend) by the same power of 10, until the divisor is a whole number.

$\frac{84\times 10}{0.01\times 10}$ = $\frac{840}{0.1}$

to make divisor a whole number we will again multiply both the numbers by 10.

$\frac{840\times 10}{0.1\times 10}$ = $\frac{8400}{1}$ = 8,400

Now answer would be 8400.

Therefore, Cheryl is correct.

7 0

3 years ago