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SIZIF [17.4K]
3 years ago
14

Helpppppppppppppppppppppppppppp

Mathematics
1 answer:
Butoxors [25]3 years ago
4 0

Answer:

x = 2

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtract Property of Equality

Step-by-step explanation:

<u>Step 1: Define</u>

10.5x - 1.9 = 19.1

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Add 1.9 to both sides:                    10.5x = 21
  2. Divide 10.5 on both sides:             x = 2

<u>Step 3: Check</u>

<em>Plug in x into the original equation to verify it's a solution.</em>

  1. Substitute in <em>x</em>:                     10.5(2) - 1.9 = 19.1
  2. Multiply:                                21 - 1.9 = 19.1
  3. Subtract:                               19.1 = 19.1

Here we see that 19.1 does indeed equal 19.1.

∴ x = 2 is a solution to the equation.

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Congress regulates corporate fuel economy and sets an annual gas mileage for cars. A company with a large fleet of cars hopes to
Dimas [21]

Answer:

The calculated value t= 3,947 >  2.0301 at 0.05 level of significance ( two tailed test) with 35 degrees of freedom.

Null hypothesis is rejected

There is no strong evidence that they have attained their fuel economy​ goal.

Step-by-step explanation:

<u>Step (i):</u>-

A company with a large fleet of cars hopes to meet the goal of 38.2 mpg or better for their fleet of cars.

Population mean 'μ' = 38.2mpg

Given the gasoline usage for 36 company trips chosen at​ random, finding a mean of 40.20 mpg and a standard deviation of 3.04 mpg.

Sample size 'n' = 36

mean  of the Sample 'x⁻' = 40.20mpg

standard deviation of the Sample 'S' = 3.04 mpg.

<u>Step(ii)</u>:-

Null hypothesis: H₀: 'μ' = 38.2mpg

Alternative hypothesis: H₁: 'μ' ≠ 38.2mpg

Level of significance ∝=0.05

The test of hypothesis

                             t = \frac{x^{-} - mean}{\frac{S}{\sqrt{n} } }

                            t = \frac{40.20- 38.20}{\frac{3.04}{\sqrt{36} } } = 3.947

The degrees of freedom ν= n-1 = 36-1 =35

The tabulated value t₀.₀₅ =  2.0301 at 0.05 level of significance ( two tailed test) with 35 degrees of freedom.

The calculated value t= 3,947 >  2.0301 at 0.05 level of significance ( two tailed test) with 35 degrees of freedom.

Null hypothesis is rejected

<u>Conclusion:</u>-

There is no strong evidence that they have attained their fuel economy​ goal.

4 0
3 years ago
I WILL GIVE BRAINLIEST!!!! HELP PLEASE!!!!!!!!!!!!!!!! BRAINLIEST!!!!!!!!!!!!! PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
nadezda [96]

Answer:

416 passengers

Step-by-step explanation:

Dont stress out, it’s just simple subtraction,

so A380 can transport 555 which is 139 more then 747

so subtract 555-139 which will give you 416 passengers.

3 0
3 years ago
Read 2 more answers
Linda. owed 8 lawns this week and earned $56. how much would Linda have earned if she had mowed 10 lawns?
Drupady [299]
56 / 8 = 7
7 * 10 = 70

She would have earned $70

6 0
3 years ago
How do you do this? I have no idea
Helga [31]

Answer:

c

Step-by-step explanation:

5 0
3 years ago
PLEASE HELP If P(A)=0.2 and P(A and B)=0.12, and P(A or B)=0.68, what is P(B)?
ruslelena [56]

Answer:

YOU ADD UP ALL THE DECIMALS

Step-by-step explanation:

6 0
3 years ago
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