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katovenus [111]
3 years ago
5

Hi, I need some help on this question

Mathematics
1 answer:
Alenkasestr [34]3 years ago
6 0

Answer:

A : 20x+21=30x-29

B : m<1 = 121   m<2 = 121

Step-by-step explanation:

Original equation

  • 20x+21=30x-29

Add +29 to both sides

  • 20x+50=30x

Subtract -20x

  • 50=10x

Divide by 10

  • 5 = x

Checking your work and doing substitution

20(5)+21

100+21

121

30(5)-29

150-29

121

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She has 7 $5 dollar bills and 4 $1 dollar bills.

Step-by-step explanation:

& times 5 plus 4.

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Write each number as a power of the given base. 343; base 7
Sliva [168]
343=7×7×7
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Salsk061 [2.6K]

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Step-by-step explanation:

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. A used car dealer says that the mean price of a two-year old sedan (in good condition) is at least $20,500. You suspect this c
Taya2010 [7]

Answer: There is sufficient evidence to reject the dealer's claim that the mean price is at least $20,500

Step-by-step explanation:

given that;

n = 14

mean Ж = 19,850

standard deviation S = 1,084

degree of freedom df = n - 1 = ( 14 -1 ) = 13

H₀ : ц ≥ 20,500

H₁ : ц < 20,500

Now the test statistics

t = (Ж - ц) / ( s/√n)

t = ( 19850 - 20500) / ( 1084/√14)

t = -2.244

we know that our degree of freedom df = 13

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so P = 0.0215

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we can confidently say that since our p value is less than the significance level, we reject the null hypothesis ( H₀ : ц ≥ 20,500 )

There is sufficient evidence to reject the dealer's claim that the mean price is at least $20,500

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3 years ago
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