All categories

3 years ago

Simplify (7x)- (-2x). A 5x B-5x C9x D-9x

Mathematics

2 answers:

Scrat [10]3 years ago

7 0

Answer: The correct option is

(C) 9x.

Step-by-step explanation: We are given to simplify the following expression :

$E=(7x)-(-2x)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

We will be using the following rule in simplifying the given expression :

$a-(-b)=a+b.$

From expression (i), we get

$E\\\\=(7x)-(-2x)\\\\=7x+2x\\\\=(7+2)x\\\\=9x.$

Thus, the required simplified form is 9x.

Option (C) is CORRECT.

WITCHER [35]3 years ago

6 0

You answer is C because 7-(-2) is 9 and then u just had an X at the end .

Hope this helps:)

You might be interested in

At a bargain store, Tanya bought 3 items that each cost the same amount. Tony bought 4 items that each cost the same amount., bu

TEA [102]

Answer: Let x represent the cost of one of Tanya's items.

Then the cost of one of Tony's items =x - 2.25. But we have:

3x =4(x - 2.25)

3x =4x - 9 subtract 3x from both sides

0 =x - 9 add 9 to both sides

x=$9 The cost of one of Tanya's items

27 Total cost of Tanya's 3 items

2.25 =$6.75 cost of one of Tony's items.

27 Total cost of Tony's 4 items.

3 x 6.75 =$27. This shows that both Tony and Tanya spent the same amount of money.

Step-by-step explanation:

6 0

3 years ago

The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard dev

Vladimir [108]

Answer:

Probability that the average length of a sheet is between 30.25 and 30.35 inches long is 0.0214 .

Step-by-step explanation:

We are given that the population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.

Also, a sample of four metal sheets is randomly selected from a batch.

Let X bar = Average length of a sheet

The z score probability distribution for average length is given by;

Z = $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\mu$ = population mean = 30.05 inches

$\sigma$ = standard deviation = 0.2 inches

n = sample of sheets = 4

So, Probability that average length of a sheet is between 30.25 and 30.35 inches long is given by = P(30.25 inches < X bar < 30.35 inches)

P(30.25 inches < X bar < 30.35 inches) = P(X bar < 30.35) - P(X bar <= 30.25)

P(X bar < 30.35) = P( $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ < $\frac{30.35-30.05}{\frac{0.2}{\sqrt{4} } }$ ) = P(Z < 3) = 0.99865

P(X bar <= 30.25) = P( $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ <= $\frac{30.25-30.05}{\frac{0.2}{\sqrt{4} } }$ ) = P(Z <= 2) = 0.97725

Therefore, P(30.25 inches < X bar < 30.35 inches) = 0.99865 - 0.97725

= 0.0214

7 0

3 years ago

Solve <br> p(x+q)=r for x.

alisha [4.7K]

Divide each side by p
P(x+q)/p=r/p
X+q=r/p
Subtract q from each side
X=r/p-q

5 0

3 years ago

Read 2 more answers

Omg pls help its proving the sum of the interior angle measures of a triangle is 180

Sav [38]

Answer:

Step-by-step explanation:

all angles in a triangle measures 180°

3 0

3 years ago

Read 2 more answers

What type of number is: 5? What type of number is 0?

Vlada [557]

Answer:

0 is rational

5 rational so u are correct

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers