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3 years ago

How do you solve 5(3x+7) =3 (5x+7) ?

1 answer:

4 0

5(3x+7)=3(5x+7)

15x+35=15x+21

cancel out the 15x. If you bring over one of the 15x it's going to naturally cancel each other out.

35=21

35 does not equal 21

it would be the equal sign with the slash coming through it

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A man bought certain number of litches

Arlecino [84]

Answer: The loss is 4%

Step-by-step explanation:

Lets call litches that are 20 pcs per Rs 100 - litches A

that are 30 pcs per Rs 100- litches B

So a man can buy 2 pcs A per Rs 10

and 3 pcs B per Rs 10

6x pcs A per Rs 30x

and 6x pcs B per Rs 20x

Now he gonna sell the 12x litches for y Rs

Lets find y from the proportion

12x cost y

25 cost 100

y/12=100/25

y=48 Rs

So the man bought 6x A + 6x B for 20x+30x=50 Rs

And then he sold them for 48 Rs

Obviously the man gonna loose the money.

Lets find the losses in %

(50-48)/50*100=200/50=4%

The loss is 4%

3 0

3 years ago

Rewrite in slope intercept<br><br> a(bx + y) = c

GrogVix [38]

Y=abx +c ……………..loll

8 0

3 years ago

A police officer wants to know the proportion of crimes that are burglaries within the last five years. She randomly selects 40

svlad2 [7]

Answer:

a. Yes

See explanation below.

Step-by-step explanation:

Assuming that if the question is if we can use the normal approximation for the true proportion.

For this case we have n = 40 and p = 0.3 (probability of success)

We need to check some conditions:

1) Random sample : This condition is satisfied since the problem says that she randomly select 40 records

2) $n \hat p = 40*0.3 =12 \geq 10$

$n(1-\hat p)= 30 *(1-0.3) = 28 \geq 10)$

3) 10% condition: the random sample is assumed to be less than 10% of the original population size (assumed)

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})$

So then as we can see the normal approximation for this case makes sense since we have all the 3 conditions satisfied so then the answer would be:

a. Yes

7 0

3 years ago

Find RT please and thank you.

valkas [14]

RQ × RP = RS × RT

9 × ( 9 + 13 ) = 11 × RT

9 × 22 = 11 × RT

Divide sides by 11

9 × 22 / 11 = 11 × RT / 11

Simplification

9 × 2 = RT

RT = 18

8 0

3 years ago

Raina is staining the wooden floor of a court. The court is in the shape of a rectangle. Its length is 33 feet and its width is

Lerok [7]

Answer:

33*32=1,056 square feet then divide 1,056÷132=8 you will need 8 cans to cover the court.

7 0

3 years ago