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2 years ago

How many intervals of 1/2 are between -1 and 2?

Mathematics

1 answer:

Debora [2.8K]2 years ago

3 0

There are 7 intervals of 1/2 between -1 and 2.

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Find x in this 45°-45°-90° triangle. x =

Leokris [45]

Answer:

x = 1.2√2

Step-by-step explanation:

Taking the cosine value of the angle :

cos 45° = 1.2/x
1/√2 = 1.2/x
x = 1.2√2

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1 year ago

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A couch and coffee table cost a total of $1167. The cost of the couch is two times the cost of the coffee table. Find the cost o

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Answer:

The couch is $778 and the table is $389

Step-by-step explanation:

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2 years ago

What is the LCD of 5/42 and 7/30

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The lowest common denominator of 5/42 and 7/30 is 210.

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3 years ago

A store offers four different brands of a product. It decides to eliminate the brand that is most likely to be returned. The tab

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Answer: brand C

Step-by-step explanation:

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2 years ago

The average expenditure on Valentine's Day was expected to be $100.89 (USA Today, February 13, 2006). Do male and female consume

AfilCa [17]

Answer:

Yes. The male and female consumers differ in the amounts they spend.

Step-by-step explanation:

We can express the null and alternative hypothesis as:

$H_0: \mu_m=\mu_w\\\\H_1: \mu_m\neq\mu_w$

It is assumed a significance level of 0.05.

The standard deviation of the difference of means is calculated as:

$s=\sqrt{\frac{s_m^2}{n_m} +\frac{s_w^2}{n_w} } =\sqrt{\frac{35^2}{40} +\frac{20^2}{30} } =\sqrt{30.625+13.333} =\sqrt{43.958} =6.63$

The test statistic is

$t=\frac{(M_m-M_w)-0}{s}=\frac{135.67-68.64}{6.63}=10.11$

The degrees of freedom are:

$df=n_1+n_2-2=40+30-2=68$

The P-value for t=10.11 is P=0, so it is smaller than the significance level. The null hypothesis is rejected.

We can conclude that male and female consumers differ in the amounts they spend.

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3 years ago