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3 years ago

Help me with this question please!

Mathematics

2 answers:

BigorU [14]3 years ago

6 0

Answer:

c = 40d+20

Step-by-step explanation:

He has to pay 20 dollars and that can't multiply so the forty has to multiply and it would have to be by d because c is the total cost

Minchanka [31]3 years ago

3 0

Answer:

c=$40d+20

Step-by-step explanation:

because 40 dollars a day and we dont know for how many days so we put a varible and plus the 20 dollars equals the total cost

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1. Can cross multiplication be used to solve this problem? Why or why not? HELP

garri49 [273]

Answer:

Step-by-step explanation:

Cross multiplication can be used but not in the beginning. First x should be isolated.

$3 +\frac{5}{x}=\frac{7}{x}\\\\$

Now subtract $\frac{5}{x}$ from both sides

$3 = \frac{7}{x}-\frac{5}{x}\\\\3=\frac{7-5}{x}\\\\3=\frac{2}{x}$

In this stage, cross multiplication can be used.

$\frac{3}{1}=\frac{2}{x}\\\\3*x=2*1\\\\x = \frac{2}{3}$

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3 years ago

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Its past due so plz help me

AveGali [126]

Answer:

y= 5/8x

Step-by-step explanation:

When it says y is it typically means y=.

When it says 5/8 of a number or of a variable it means that number times that variable.

Hope this helps!

5 0

3 years ago

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What is the solution to the system below? −4x+5y=27 x−6y=−2

Lubov Fominskaja [6]

Answer:

(-8,-1)

Step-by-step explanation:

5 0

3 years ago

Please explain how to help me learn please

devlian [24]

Https://us-static.z-dn.net/files/d5b/b845384fc1268b12d8e26abf6f82a538.jpeg

5 0

4 years ago

Use the law of cosines to solve for the length of side b. Show all of your work for full credit.

BigorU [14]

According to the law of cosines:

$AC^2=AB^2+BC^2-2\cdot AB\cdot BC\cdot\cos33^{\circ}$ .

Substituting all the values we know and finding $\cos33^{\circ}\approx0.84$ using a calculator, we have:

$b^2=16^2+11^2-2\cdot 16\cdot 11\cdot 0.84\\\\b^2=256+121-295.68\\\\b^2=81.32\\\\b=\pm \sqrt{81.32} \approx\pm9$

We discard the negative solution clearly.

Answer: b=9 units

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3 years ago

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