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4 years ago

Which expression represents the difference (7b+3)−(2b−8)?

Mathematics

1 answer:

kenny6666 [7]4 years ago

3 0

Answer:

the last option...5b + 11

Step-by-step explanation:

7b+3 - 2b + 8

= 7b - 2b + 3 + 8

= 5b + 11

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If the cost price of 21 articles is equal to the selling price of 18 articles, find the profit percentage

Ksenya-84 [330]

Answer: 14.29%

Step-by-step explanation:

Let C be the cost of 1 article and S the selling price for 1 article. The profit, P, for 1 article would be:

P = S - C

For n articles, the total profit would be

nP = nS - nC

Profit percentage would be (P/S)*100%

---------------------------------------------------------

We know that 21C = 18S: This can be written as C = (18/21)S

P = S - C

P = S - (18/21)S

P = (3/21)S or P=(1/7)S

Profit percentage would therefore be

(P/S)*100%

((1/7)S/S)*100%

(1/7)*100%

= 14.29%

5 0

3 years ago

Laundry detergent as price 20 ounces for $3.40 or 14 ounces for $2.10 what is the unit rate of the laundry detergent that is the

Roman55 [17]

The better deal is 14 ounces for $2.10 and is $0.15

5 0

3 years ago

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What is the distance between the points (-7,3) and (4,-5) on a coordinate plane

LenKa [72]

Answer:

b because c 13 is too far away for one coordinate were it is not too long and to short

Step-by-step explanation:

5 0

3 years ago

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Tim sold half of his comics collection and then bought 16 more. If he now has 36, how many did he begin with?

STALIN [3.7K]

Tim began with 40 comics

Further explanation:

The equation involve linear equation as there is only one object i.e. comic books

So,

Let x be the number of comic books Tim began with

Then after selling half comics Tim will have x/2 comics remaining

Now when he buys 16 more the expression will be:

$\frac{x}{2}+16$

He has total 36 books, then

$\frac{x}{2}+16= 36$

Subtracting 16 from both sides

$\frac{x}{2}+16-16= 36-16$

${\frac{x}{2}}= 20\\$

Multiplying 2 on both sides

${\frac{x}{2}}* 2= 20*2\\x=40$

<u>We can recheck, if he had 40, half of them will be 20 and adding 16 makes them 36.</u>

Tim began with 40 comics

Keywords: Equation in one variable, linear equations

Learn more about linear equations at:

#LearnwithBrainly

6 0

4 years ago

Suellyn correctly evaluates the expression.

Effectus [21]

Answer:

Step-by-step explanation:

its The first factor is equal to -14.9 and The product is 14.9

5 0

3 years ago

Read 2 more answers