2 years ago

3x7 I need help with this i do not know the answer pls help.

Mathematics

1 answer:

kakasveta [241]2 years ago

3 0

Answer:

Step-by-step explanation:

7+7+7=21

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elixir [45]

Answer:

f(-5) = 22

Step-by-step explanation:

All we do is substitute x = -5 into the function.

= -3(-5) + 7

= 15 + 7

= 22

Best of Luck!

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3 years ago

Read 2 more answers

John rides his bike with a constant speed of 20 km/h. How far can he travel in 2 1/2 hours?

Olegator [25]

Ok so,

20*2= 40

20*1/2=10

40+10=50

So Johncan travel 50 km in 2 1/2 hours.

Hope this helps :)

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2 years ago

At a 33-foot depth underwater, the pressure is 29.55 pounds per square inch (psi). At a depth of 66 feet, the pressure reaches 4

andrezito [222]

I am thinking it is times 2 everytime

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3 years ago

In preparing a certain ointment, a pharmacist used 28.35 g of zinc oxide instead of the 31.1 g called for. Calculate the percent

Vilka [71]

Answer: 9.70%

Step-by-step explanation:

The formula to find the percentage error is given by :-

$\%\text{ error}=\dfrac{|\text{Estimate-Actual}|}{\text{Actual}}\times100$

Given : Actual mass of zinc oxide used by pharmacist = 28.35 g

Estimated mass of zinc oxide used by pharmacist =31.1 g

Now, $\%\text{ error}=\dfrac{|31.1-28.35|}{28.35}\times100$

i.e. $\%\text{ error}=\dfrac{2.75}{28.35}\times100$

i.e. $\%\text{ error}=9.70017636684\approx9.70\%$

Hence, the percentage of error on the basis of the desired quantity.= 9.70%

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3 years ago

Rhianna's movie collection contains 18 movies, including 8 comedies.

garri49 [273]

The answer would be =4 over 9 =4/9 hope this helps

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2 years ago