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3 years ago

I need help plz and thank you

Mathematics

2 answers:

Lelechka [254]3 years ago

7 0

How do you need help? with what? haha

Aleksandr-060686 [28]3 years ago

3 0

Ion see nun. Where is it

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To get to school, Grayson usually walks 1.5 miles west and 0.8 miles north on the sidewalks. Because he is in a hurry, he has de

Alex17521 [72]

Answer:

Grayson has to walk 1.7 miles across the field.

Step-by-step explanation:

We have drawn the diagram for your reference.

Given:

Grayson usually walks 1.5 miles west on the side walks

According to Diagram we can say;

CA = 1.5 miles

Also Given:

Grayson also walks 0.8 miles north on the sidewalks

So According to Diagram we can say;

BA =0.8 miles

Now we need to find number of miles Grayson have to walk across the field.

According to diagram we can say;

We have to find CA.

Assuming the diagram to be right angled triangle.

We can find CA using Pythagoras theorem.

${CA}^2 = {CB}^2+{BA}^2$

Substituting the given values we get;

${CA}^2 =1.5^2+0.8^2 = 2.25 +0.64 =2.89$

Taking square root on both side we get;

$\sqrt{{CA}^2} = \sqrt{2.89} \\\\CA = 1.7 \ mi$

Hence Grayson has to walk 1.7 miles across the field.

4 0

3 years ago

On your last math test you earned an 88%. Of the 26 questions on the test, how many did you get correct?

dybincka [34]

Answer:

i belive the answer is 23

Step-by-step explanation:

You just have to divide then multiple by 100

7 0

3 years ago

Read 2 more answers

Math, i need helpp plss

MissTica

$80-$35

=$45

$45+$115

=$160

his account balance is $160

6 0

3 years ago

Read 2 more answers

1. The national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15. The dean of a college wants to kno

Nat2105 [25]

Answer:

We conclude that the mean IQ of her students is different from the national average.

Step-by-step explanation:

We are given that the national mean (μ) IQ score from an IQ test is 100 with a standard deviation (s) of 15.

The dean of a college want to test whether the mean IQ of her students is different from the national average. For this, she administers IQ tests to her 144 students and calculates a mean score of 113

Let, Null Hypothesis, $H_0$ : $\mu$ = 100 {means that the mean IQ of her students is same as of national average}

Alternate Hypothesis, $H_1$ : $\mu\neq$ 100 {means that the mean IQ of her students is different from the national average}

(a) The test statistics that will be used here is One sample z-test statistics;

T.S. = $\frac{Xbar-\mu}{\frac{s}{\sqrt{n} } }$ ~ N(0,1)

where, Xbar = sample mean score = 113

s = population standard deviation = 15

n = sample of students = 144

So, test statistics = $\frac{113-100}{\frac{15}{\sqrt{144} } }$

= 10.4

Now, at 0.05 significance level, the z table gives critical value of 1.96. Since our test statistics is more than the critical value of z which means our test statistics will fall in the rejection region and we have sufficient evidence to reject our null hypothesis.

Therefore, we conclude that the mean IQ of her students is different from the national average.

3 0

4 years ago

Right triangle XYZ has right angle Z. If the sin(X)=1213<br> , what is the cos(X)

AlekseyPX

Given:

Right triangle XYZ has right angle Z.

$\sin(x)=\dfrac{12}{13}$