2 years ago

Explain to me how to do this please

Mathematics

1 answer:

nataly862011 [7]2 years ago

6 0

You must first attach the problems with your question.

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A doctor prescribes a 100-mg antibiotic tablet to be taken every eight hours. Just before each tablet is taken, 20% of the drug

zvonat [6]

Answer:

120 mg

Step-by-step explanation:

20% of 100 is 20 so that would be 20mg plus the 100mg they just took

100+20=120mg

i hope this helps you!

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2 years ago

A frame of width a surrounds a 5 by 7 inch photograph. Find the expression that represents the area of the frame in terms of a.

Arada [10]

See diagram
totalarea=totallengtht times totalwidth=(2a+5) times (2a+7)=4a²+24a+35

minus original aera
which is 5 by 7 which is 35

4a²+24a+35-35=4a²+24a

3rd option I think, can't tell which is which

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2 years ago

Find -3/7 divided by -15/1

posledela

Answer:

1/35

Step-by-step explanation:

-3/7 / -15/1 =

3/7 * 1/15 =

3 / 105 =

1/35

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2 years ago

Cory has 20 crayons. He wants to give the same number of crayons to each of his friend. Write 2 different questions about Cory'

SpyIntel [72]

Answer:

Step-by-step explanation: how many frenis are there?

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2 years ago

The equation x^3+x^2+ax-4=0 has one root equal to -2. Find the value of a.

Vedmedyk [2.9K]

Answer:

a = - 4

Step-by-step explanation:

Given x = - 2 is a root then f(- 2) = 0

f(x) = x³ + x² + ax - 4, thus

f(- 2) = (- 2)³ + (- 2)² - 2a - 4 = 0, that is

f(- 2) = - 8 + 4 - 2a - 4 = 0, thus

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- 2a = 8 ( divide both sides by - 2 )

a = - 4

5 0

3 years ago