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3 years ago

3/4(2x-6)-2(1/2x+1)-1+5x

Mathematics

2 answers:

OlgaM077 [116]3 years ago

6 0

Answer:

Distribute:

)(2x)+(

)(−6)+(−2)(

x)+(−2)(1)+−1+5x

−9

+−x+−2+−1+5x

Combine Like Terms:

−9

+−x+−2+−1+5x

x+−x+5x)+(

−9

+−2+−1)

−15

Step-by-step explanation:

True [87]3 years ago

5 0

Answer:

Hello!

Your math problem is

in the picture!

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on the last 5 quizzes, marco has earned a total of 21 out of 25 possible points. if he has a perfect score on the next several q

nevsk [136]

Using the mean concept, it is found that we will need 15 more points to bring up his average up to 90%.

The mean of a data-set is the <u>sum of all observations divided by the number of observations</u>.

In this problem:

In the first 5 observations, total of 21 out of 25 points, hence the mean for these observations is $\frac{21}{25} = 0.84$ .
In the next n observations, mean of 1.

Hence, the mean is:

$M = \frac{0.84(5) + n}{5 + n} = \frac{4.2 + n}{5 + n}$

We want the mean to be of 0.9, thus:

$M = 0.9$

$\frac{4.2 + n}{5 + n} = 0.9$

$4.2 + n = 0.9n + 4.5$

$0.1n = 0.3$

$n = \frac{0.3}{0.1}$

$n = 3$

3 more testes are need, each worth 5 points, hence, 15 more points are needed to bring up his average up to 90%.

A similar problem is given at brainly.com/question/25323941

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3 years ago

What is the midpoint of a segment whose endpoints are (-3, -3) and (-13, -13)

Nat2105 [25]

The midpoint of that segment is (-8,-8).

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3 years ago

Select the expression that is equivalent to (x-3)^2

Elan Coil [88]

Answer:

${ \tt{ {(x - 3)}^{2} }} \\ \\ = { \tt{(x - 3)(x - 3)}} \\ \\ = { \tt{ {x}^{2} - 6x + 9 }}$

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3 years ago

X-5(x-1)=2x-(2x-3) answer the question

levacccp [35]

Answer: x= 1/2

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

x−5(x−1)=2x−(2x−3)

x−5(x−1)=2x+−1(2x−3)(Distribute the Negative Sign)

x−5(x−1)=2x+−1(2x)+(−1)(−3)

x−5(x−1)=2x+−2x+3

x+(−5)(x)+(−5)(−1)=2x+−2x+3(Distribute)

x+−5x+5=2x+−2x+3

(x+−5x)+(5)=(2x+−2x)+(3)(Combine Like Terms)

−4x+5=3

Step 2: Subtract 5 from both sides.

−4x+5−5=3−5

−4x=−2

Step 3: Divide both sides by -4.

−4x /−4 = −2 /−4

x = 1/2

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3 years ago

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Answer:

The amount invested in bonds = 35,000

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Step-by-step explanation:

The total amount that Daniela invested is $50,000, this means if we call the amount invested in bonds $b$ , and the amount invested in CD $d$ , then we have: