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3 years ago

Use parallelogram ABCD. What are the values of x and

Mathematics

1 answer:

castortr0y [4]3 years ago

4 0

Answer:

the value of x is a number but you can say 1 when you are factorising quadratic expression with the terms

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Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follow

guajiro [1.7K]

Answer:

a) x = 1.52

b) s = 1.16

Step-by-step explanation:

We have that:

5 students watched 0 movies.

9 students watched 1 movie.

5 students watched 2 movies.

5 students watched 3 movies.

1 student watched 4 movies.

(a) Find the sample mean x.

Sum divided by the number of students. So

$x = \frac{5*0 + 9*1 + 5*2 + 5*3 + 1*4}{5 + 9 + 5 + 5 + 1} = \frac{38}{25} = 1.52$

(b) Find the approximate sample standard deviation, s.

Standard deviation of the sample.

Square root of the sum of the squares of the values subtracted from the mean, divided by the sample size subtracted by 1. So

$s = \sqrt{\frac{5*(0-1.52)^2 + 9*(1-1.52)^2 + 5*(2-1.52)^2 + 5*(3-1.52)^2 + 1*(4-1.52)^2}{24}} = \sqrt{\frac{32.24}{24}} = 1.16$

3 0

3 years ago

Andre wants to buy a bike that has a price tag of $125. What was the wholesale cost of this bike?

san4es73 [151]

The bike store marks up the wholesale cost of all of the bikes they sell by 30%. Andre wants to buy a bike that has a price tag of $125. What was the wholesale cost of this bike?

Answer:

$96.15

Step-by-step explanation:

Let x be the wholesale cost of the bike.

Given:

Price tag of a bike = $125.

The bike store marks up the wholesale cost of all of the bikes they sell by 30%.

So we can find the wholesale cost of the bike by the following way.

$\frac{100+30}{100}\times x = 125$

$\frac{130}{100}\times x = 125$

$x=\frac{125\times 100}{130}$

$x=\frac{12500}{130}$

$x=\frac{1250}{13}$

$x=96.15$

Therefore, the wholesale cost of the bike is $96.15.

7 0

3 years ago

Write the ratio in simplest form, there are 44 monkeys and 77 tigers in the zoo

Ksju [112]

4:7
divide the 44 and 77 into 11 and you get the simplest form which is 4:7

8 0

3 years ago

What is m<1 and m<2 A 40 B 50 C 140 D 90

lina2011 [118]

Answer:

<h2>here...... </h2><h2>m′<1 = 40°</h2><h2>and</h2><h2> m'<2= 20°</h2><h2>------++++--------</h2><h2>sum of angle of triangle is 180°</h2>

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3 years ago

Answer fast!!!! A boy scout troop is selling Christmas trees at a local tree lot. In the morning, they sold 16 Douglas Fir trees

tekilochka [14]

Answer:idk

Step-by-step explanation:

6 0

3 years ago