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3 years ago

True or False. Explain reasoning

Mathematics

1 answer:

Kay [80]3 years ago

5 0

Answer:

false

Step-by-step explanation:

hope it helps

yan lang po alam ko

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A drought effects 9 out of 12

masya89 [10]

Answer:

You just have to divide 9 by 12 to get your answer of 75%

8 0

3 years ago

Read 2 more answers

the states C&D spend a total of 55.6 million dollars for tourism the state C spends 3.2 million dollars more than State D fi

Helga [31]

Alright, let's break this down.
State D blew 55.6 million bucks on tourism.
State C spends an unknown amount, we just know it's 3.2 million MORE than state D.
Well, since we know State D spent 55.6 million on tourism, just add 3.2 million to it to find out how much State C spent.
55.6+3.2=58.8.

This means the state's spent:
State D: 55.6
State C: 58.8

~Hope this helps!

6 0

3 years ago

F(x)=3x-2 what is the function for f(3)

Vlad1618 [11]

F(x) = 3x - 2
f(3) = 3(3) - 2
f(3) = 9 - 2
f(3) = 7

6 0

3 years ago

Factor: 128 + 2d^3 <br><br> cubes lol

BARSIC [14]

The factorization if the given expression 128 + 2d³ is 2(64 + d³).

<h3>Factorization</h3>

128 + 2d³

There are two parameters in the expression;

128
2d³

The common factors between 128 and 2d³ is 2

So,

128 + 2d³

= 2(64 + d³)

Learn more about factorization:

brainly.com/question/25829061

#SPJ1

4 0

2 years ago

A tuter promises to improve GMAT scores of students by more than 50 points after three lessons. To see if this is true, the tuto

creativ13 [48]

Answer:

t48 = 1.7500

Step-by-step explanation:

A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample. For example if we have Before-and-after observations (This problem) we can use it.

Let put some notation

x=test value before , y = test value after

The system of hypothesis for this case are:

Null hypothesis: $\mu_y- \mu_x \geq 50$

Alternative hypothesis: $\mu_y -\mu_x >50$

We have the mean difference

$\bar d= \frac{\sum_{i=1}^n d_i}{n}=53$

And the sample standard deviation for the differences, is:

$s_d =\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1} =12$

Now we can calculate the statistic given by :

$t=\frac{\bar d -\Delta}{\frac{s_d}{\sqrt{n}}}=\frac{53 -50}{\frac{12}{\sqrt{49}}}=1.75$

Since we don't have the population standard deviaition we need to use the t distribution and we can calculate the degrees of freedom given by:

$df=n-1=49-1=48$

Now we can calculate the p value, since we have a right tailed test the p value is given by:

$p_v =P(t_{(48)}>1.75) =0.0432$

If we use a significance level of 5% we have that $p_v$ , and on this case we reject the null hypothesis . And we don't have enough evidence to conclude that the difference of means it's higher than 50 points.

5 0

3 years ago