Find the root 2x2 + x-4 = 0

Anna11 [10]

Scale of model is 1 inch represent how many feet in real life
8inch=scale
30 feet=real
8:30=4:15=2:7.5=1:3.75
the one we can se taht matches is D
4 inches=15 feet
D

7. group and add like terms
sum means add btw
5x-2+x+8
5x+x-2+8
6x+6
A

6. D
7. A

7 0

3 years ago

Read 2 more answers

Which equation in slope-intercept form represents a line that is parallel to y=−4x−5 and passes through the point (0,0)?

Contact [7]

Answer:

E

Step-by-step explanation:

The line is negative and it was shifted down 5 units meaning it goes through -5,0. It needs to move up five so y=-4x-5+5= y=-4x

6 0

4 years ago

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Unlike most packaged food products, alcohol beverage container labels are not required to show calorie or nutrient content. An a

zhenek [66]

Answer:

We conclude that the true average estimated calorie content in the population sampled exceeds the actual content.

Step-by-step explanation:

We are given that an article reported on a pilot study in which each of 58 individuals in a sample was asked to estimate the calorie content of a 12 oz can of beer known to contain 153 calories.

The resulting sample mean estimated calorie level was 193 and the sample standard deviation was 88.

Let $\mu$ = true average estimated calorie content in the population sampled.

So, Null Hypothesis, $H_0$ : $\mu$ $\leq$ 153 calories {means that the true average estimated calorie content in the population sampled does not exceeds the actual content}

Alternate Hypothesis, $H_A$ : $\mu$ > 153 calories {means that the true average estimated calorie content in the population sampled exceeds the actual content}

The test statistics that would be used here One-sample t test statistics as we don't know about the population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean estimated calorie level = 193 calories

s = sample standard deviation = 88

n = sample of individuals = 58

So, the test statistics = $\frac{193-153}{\frac{88}{\sqrt{58} } }$ ~ $t_5_7$

= 3.462

The value of t test statistics is 3.462.

Since, in the question we are not given the level of significance so we assume it to be 5%. Now, at 0.05 significance level the t table gives critical value of 1.6725 at 57 degree of freedom for right-tailed test.

Since our test statistic is more than the critical value of t as 3.462 > 1.6725, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the true average estimated calorie content in the population sampled exceeds the actual content.

8 0

3 years ago

the equation d =40 - 1/5 m how many miles does anthony have to finish the race if he has been riding for one hour and twenty min

Levart [38]

Question:

Anthony is riding in a race.The equation d=40-1/5m, where d= distance in miles and m= minutes,can be used to estimate the number of miles anthony has left before reaching the finish line.how many miles does anthony have to finish the race if he has been riding for one hour and twenty minutes?

Answer:

Antony has to ride for 24 miles

Solution:

Given that,

The equation used to estimate the number of miles is:

$d = 40-\frac{1}{5}m$

Where, "m" is the minutes and "d" is the distance

Given that Antony is riding for 1 hour 20 minutes

We know that,

1 hour = 60 minutes

1 hour 20 minutes = 60 minutes + 20 minutes = 80 minutes

Substitute m = 80 in given eqn

$d = 40 - \frac{1}{5} \times 80\\\\d = 40 - 16\\\\d = 24$

Thus Antony has to ride for 24 miles

7 0

3 years ago

Associated is giving a $500 Hyland born as a new job fiance average commission of 250 per week for the next 12 weeks how much do

lara [203]

The answer is $3,500 because 250x12+500 is 3,500.

8 0

4 years ago