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3 years ago

Hey guys i need help plz will give brainlist

Mathematics

1 answer:

nadya68 [22]3 years ago

5 0

Step-by-step explanation:

Effective resistance in the 30Ω and 40Ω parallel circuit = 1 / (1/30 + 1/40) = 120/7 Ω.

20Ω + 10Ω = 30Ω

Effective resistance in the 50Ω and (20Ω + 10Ω) parallel circuit = 1 / (1/50 + 1/30) = 75/4 Ω.

Now we can add the resistances up:

Effective resistance for circuit

= 120/7 Ω + 75/4 Ω = 1005/28 Ω.

Hence I = V / R

= 9.0V / (1005/28 Ω) = 0.25A. (2s.f.)

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OverLord2011 [107]

Answer: the quotient of the given expression is, h5

Step-by-step explanation:

Use the exponent rule:

Given the expression:

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2 years ago

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ale4655 [162]

Answer:

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2 years ago

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3 years ago

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4 years ago

A credit reporting agency claims that the mean credit card debt in a town is greater than $3500. A random sample of the credit c

Lera25 [3.4K]

Answer:

Claim is false

Step-by-step explanation:

Claim : A credit reporting agency claims that the mean credit card debt in a town is greater than $3500.

$H_0:\mu \leq 3500\\H_a:\mu = 3500$

n = 20

Since n <30

So we will use t test

Formula : $t =\frac{x-\mu}{\frac{s}{\sqrt{n}}}$

s = standard deviation = 391

x = 3600

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$t =\frac{3600-3500}{\frac{391}{\sqrt{20}}}$

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α=0.10

So, using t table

$t_({\frac{\alpha}{2},d.f.})$ = 1.72

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So we accept the null hypothesis

Hence we reject the claim that the mean credit card debt in a town is greater than $3500.

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3 years ago