A ufo has a speed of 3000 km/h the distance between a and b is 7500km. how long will it take for the Ufo to fly from A to B

Please help i’ll give brainliest if you help thanks

NeTakaya

4b.

This is the answer

5 0

3 years ago

Given the right triangle shown below.if Cos A =15/17 and tan A=8/15 which of the following represents the length of BC

otez555 [7]

Answer:

The Figure for Right triangle is below,

Therefore , 15 unit length represents BC.

Step-by-step explanation:

Given:

Consider a right triangle ABC, Such that

$\cos A=\dfrac{15}{17}\\\\\tan A=\dfrac{8}{15}$

To Find:

BC = ?

Solution:

In Right Angle Triangle ABC, Cosine and Tangent identity

$\cos A = \dfrac{\textrm{side adjacent to angle C}}{Hypotenuse}\\$

$\tan A= \dfrac{\textrm{side opposite to angle A}}{\textrm{side adjacent to angle A}}$

BUT,

$\cos A=\dfrac{15}{17}\\\\\tan A=\dfrac{8}{15}$ ....Given

On Comparing,

Adjacent side to angle A = AB = 15

Opposite side to angle A = BC = 8

Hypotenuse = AC =17

Also Pythagoras theorem is Satisfies,

$(\textrm{Hypotenuse})^{2} = (\textrm{Shorter leg})^{2}+(\textrm{Longer leg})^{2}$

$(\textrm{Hypotenuse})^{2} = 17^{2}=289$

$(\textrm{Shorter leg})^{2}+(\textrm{Longer leg})^{2}=15^{2}+8^{2}=289$

The Figure for Right triangle is below,

Therefore , 15 unit length represents BC.

7 0

3 years ago

Consider the following argument:

mariarad [96]

Answer:

$r \Rightarrow p\\ q \Rightarrow p\\ r \vee p\\ (r \vee q) \Rightarrow \neg r\\ s$

Step-by-step explanation:

$r \Rightarrow p \equiv (\neg r \vee p)$ , p is false.

$q \Rightarrow p \equiv (\neg q \vee p)$ , p is false.

$(r \vee q)$ , r and q are falses.

$(r \vee q) \Rightarrow \neg r \equiv (\neg (r \vee q) \vee \neg r)$ . this sentence is true.

s

3 0

3 years ago

I love sharks! In fact, before I became a statistician, I wanted to be a marine biologist specializing in shark research (I even

Ad libitum [116K]

Answer:

Null hypothesis: $\mu \leq 15$

Alternative Hypothesis: $\mu >15$

We have enough evidence to reject the null hypothesis at 10% level of significance.

Step-by-step explanation:

1) Data given

n =44, representing the sample size

$\bar X=15.6ft$ represent the sample mean for the length of great white sharks

$s=2.5ft$ represent the sample standard deviation for the length of great white sharks

$\alpha =0.1$ significance level for the test

2) Formulas to use

On this case we are intereste on the sample mean for the length of great white sharks, and based on the paragraph the hypothesis are given by:

Null hypothesis: $\mu \leq 15$

Alternative Hypothesis: $\mu >15$

since we have n>30 but we don't know the population deviation $\sigma$ so we will can use the t approximation. The sample mean have the following distribution

$\bar X \sim N(\mu,\frac{\sigma}{\sqrt{n}})$

Based on this the statistic to check the hypothesis would be given by:

$t=\frac{\bar X-\mu}{\frac{s}{\sqrt{n}}}$

Replacing the values given we have:

$t_{calc}=\frac{15.6-15}{\frac{2.5}{\sqrt{44}}}=1.592$

We can calculate the degrees of freedom with:

$df=n-1=44-1=43$

With $\alpha$ and the degrees of freedom we can calculate the critical value, since $\alpha=0.1$ we need a value from the t distribution with 43 degrees of freedom that accumulates 0.1 of the area on the right or 0.9 of the area on the left.

We can use excel, a calculator or a table for this, calculating this value we got:

$t_{(43,critc)}=1.302$

Since our calculatesd value was $t_{calc}=1.592>t_{crit}$ , we can reject the null hypothesis at 0.1 level of significance.

Other way in order to have a criterion for reject or don't reject the null hypothesis is calculating the p value, on this case based on the alternative hypothesis the p value would be given by:

$p_v=P(t_{(43)}>1.592)=0.0594$

So then $p_v$ so we have enough evidence to reject the null hypothesis at 10% level of significance.

3 0

3 years ago

High school math help please!! What is the approximate value of the function at x = 3

katovenus [111]

Answer:

C / 1.8

Step-by-step explanation:

Because x = 3 then , you see it's an approximately y>1.5

and of course it's not exactly 2

so, the answer will be 1.8

6 0

3 years ago