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2 years ago

If 3/x= 4/5, then what is the value of x? A. 12/5 B. 1/5 C. 15/4 D. 19/5 E.3

Mathematics

1 answer:

gladu [14]2 years ago

7 0

Answer:

Step-by-step explanation:

$\frac{3}{x}=\frac{4}{5}\\$

Cross multiply,

3*5 = 4*x

15 = 4x

4x = 15 {Divide both sides by 4}

$x=\frac{15}{4}\\\\$

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WILL MARK BRAINIEST FOR FIRST PERSON TO ANSWER WITH THE STEPS

kondaur [170]

Answer:

a. 1.2 ohms

b. 6 ohms

Step-by-step explanation:

As with any problem involving evaluation of a formula, substitute the given values for the corresponding variables and do the arithmetic.

$R=\dfrac{1}{\dfrac{1}{R_1}+\dfrac{1}{R_2}}=\dfrac{1}{\dfrac{1}{2}+\dfrac{1}{3}}=\dfrac{1}{\left(\dfrac{5}{6}\right)}=\boxed{\dfrac{6}{5}=1.2}$

$R=\dfrac{1}{\dfrac{1}{R_1}+\dfrac{1}{R_2}}=\dfrac{1}{\dfrac{1}{10}+\dfrac{1}{15}}=\dfrac{1}{\left(\dfrac{5}{30}\right)}=\dfrac{30}{5}=\boxed{6}$

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<em>Comment on these problems</em>

You will notice that the values in part (b) are 5 times those in part (a). So, it is no surprise that the answer in part (b) is 5 times the answer in part (a).

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3 years ago

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Vilka [71]

Answer:

Part A: yes

Part B: yes

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Step-by-step explanation:

Part A:

77² + 420² = 427²

5,929 + 176,400 = 182,329

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Part B:

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Part C:

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2 years ago

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tankabanditka [31]

3:40
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