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3 years ago

-7a-3<2a Please solve

Mathematics

2 answers:

Alex_Xolod [135]3 years ago

6 0

Answer:

2A or II-A may refer to: Alberta Highway 2A · Alpha-2A adrenergic receptor · Keratin 2A · Massachusetts Route 2A · Stalag II-A · Telecom 2A, a satellite

Step-by-step explanation:

i think this is it or wht you talking about

rusak2 [61]3 years ago

4 0

Answer:

a>-1/3

Step-by-step explanation:

-7a-2a<3

-9a<3

-a<3/9

a>-3/9

a>-1/3

You switch the sign because your dividing by a negative.

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3 years ago

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What are the solutions to the following system?<br> -2 x² + y = -5<br> y=-3x²+5

Arturiano [62]

Answer:

$x=\pm\sqrt{2}$

Step-by-step explanation:

This system of equations is convenient, because the second equation already expresses y in terms of x. Now, you can substitute that in.

$-2x^2-3x^2+5=-5$

Multiplying both sides by -1 and bringing the 5 over:

$2x^2+3x^2-10=0$

Combining like terms and factoring out 5:

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Factoring:

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3 years ago

Consider estimating a population proportion p. What is the most conservative sample size (erring on the large size) required in

just olya [345]

Answer:

The most conservative sample size is 2401.

Step-by-step explanation:

We are given the following in the question:

We are not given any approximation of s]ample proportion, thus,

$\hat{p} = 0.5$

We have to construct a 95% confidence interval.

Margin of error = 2% = 0.02

Formula for margin of error =

$z_{stat}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

Putting values, we get,

$0.02 = 1.96\times \sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}\\\\0.02 = 1.96\times \sqrt{\dfrac{0.5(1-0.5)}{n}}\\\\\sqrt{n} = 1.96\times \dfrac{\sqrt{0.5(1-0.5)}}{0.02}\\\\\sqrt{n}=49\\n = 2401$

Thus, the most conservative sample size is 2401.

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3 years ago

Maria operates a taco truck in her neighborhood. She has created a graph based on her business performance in the previous year.

SIZIF [17.4K]

Answer:

3)Maria is running a profitable business.

4)Maria’s total revenue exceeds her total profit.

Step-by-step explanation:

The graph shows variation of revenue and cost with respect to price of product and not with respect to time .

The price of the product is 2.30 . From this graph , we see that at this price revenue exceeds total cost . So maria is running a profitable business .

Total profit can not exceed total revenue as

Total revenue - total cost = total profit .

So total profit will always be less than total revenue .

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4 years ago