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3 years ago

Find the sum: (7b -2) + (-4b + 5)

Mathematics

1 answer:

SCORPION-xisa [38]3 years ago

8 0

Answer:

$=3b+3$

Step-by-step explanation:

$\mathrm{Remove\:parentheses}:\quad \left(a\right)=a$ , $=7b-2-4b+5$ .

$\mathrm{Group\:like\:terms}$ :

$=7b-4b-2+5$

$\mathrm{Add\:similar\:elements:}\:7b-4b=3b$

$=3b-2+5$

$\mathrm{Add/Subtract\:the\:numbers:}\:-2+5=3$

$=3b+3$

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Step-by-step explanation:

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3 years ago

Read 2 more answers

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mash [69]

I used the proportion:
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18. A science teacher has a supply of 20% saline solution and a supply of 50% saline solution. How much of each solution should

IrinaK [193]

Answer: Option 'B' is correct.

Step-by-step explanation:

Since we have given that

There is a supply of 20% saline solution and a supply of 50% saline solution.

If a teacher wants to mix together to get 60 ml of 28% saline solution for an experiment.

We will use "Mixture Allegation" to find the quantity of each solution:

Ist type of solution II nd type of solution

20% 50%

28%

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

50%-28% : 28%-20%

22% : 8%

11 : 4

Since there is total quantity of 60 ml of solution.

So, Quantity of 20% solution in the mixture is given by

$\frac{11}{15}\times 60=11\times 4=44\ ml$

Quantity of 50% solution in the mixture is given by

$\frac{4}{15}\times 60=4\times 4=16\ ml$

Hence, there is 44 ml of the 20% solution and 16 ml of the 50% solution.

Therefore, Option 'B' is correct.

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3 years ago