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1 year ago

Is anybody good at maths15times15 divide by 20 takeway 5 add100

Mathematics

2 answers:

Veronika [31]1 year ago

8 0

$111.2$

Step-by-step explanation:

As per the question, 15 times 15 i.e. 225

$15 \times 15 = 225$

225 divide by 20 i.e. 11.25

$\frac{225}{20} = 11.25$

take away five from the 11.25 then it will be 11.2

Add 100 to 11.2 i.e

$11.2 + 100 = 111.2$

ella [17]1 year ago

3 0

Answer: 115

Step-by-step explanation:

$\displaystyle\\\frac{15*15}{20-5} +100=\\\\\frac{15*15}{15} +100=\\\\15+100=\\\\115$

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sukhopar [10]

4log6-log2 =
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log3⁴=
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but I think they want you to stop at log 81

8 0

3 years ago

Subtract: 3x 2 -7x 4 from 5x 2 - 3x 8.

Andrew [12]

(3x² -7x⁴) from (5x² - 3x⁸)

= 5x² - 3x⁸ - (3x² -7x⁴ )

= 5x² - 3x⁸ - 3x² + 7x⁴

= - 3x⁸ + 7x⁴ + 5x² - 3x²

= - 3x⁸ + 7x⁴ + 2x²

4 0

2 years ago

A group of researchers wants to know whether men are more likely than women to contract a novel coronavirus. They surveyed two r

olasank [31]

Answer:

Test statistic Z= 0.13008 < 1.96 at 0.10 level of significance

null hypothesis is accepted

There is no difference proportion of positive tests among men is different from the proportion of positive tests among women

Step-by-step explanation:

Step(I):-

Given surveyed two random samples of 390 men and 360 women who were tested

first sample proportion

$p_{1} = \frac{360}{390} = 0.9230$

second sample proportion

$p_{2} = \frac{47}{52} = 0.9038$

Step(ii):-

Null hypothesis : H₀ : There is no difference proportion of positive tests among men is different from the proportion of positive tests among women

Alternative Hypothesis:-

There is difference between proportion of positive tests among men is different from the proportion of positive tests among women

$Z = \frac{p_{1}- p_{2} }{\sqrt{PQ(\frac{1}{n_{1} }+\frac{1}{n_{2} } } }$

where

$P = \frac{n_{1}p_{1} +n_{2} p_{2} }{n_{1}+n_{2} }$

P = 0.920

$Z= \frac{0.9230-0.9038}{\sqrt{0.920 X0.08(\frac{1}{390}+\frac{1}{52} } )}$

Test statistic Z = 0.13008

Level of significance = 0.10

The critical value Z₀.₁₀ = 1.645

Test statistic Z=0.13008 < 1.645 at 0.1 level of significance

Null hypothesis is accepted

There is no difference proportion of positive tests among men is different from the proportion of positive tests among women

7 0

3 years ago

Solve for xx. Round to the nearest tenth, if necessary.

jasenka [17]

Step-by-step explanation:

S+T+U=180°{sum of angle of triangle}

68°+90°+U=180°
U=180-158°
U=22°

sin theta= p/h

sin22°=x/83

o.37=x/83

x=0.37×83

x=30.71

x=31

stay safe healthy and happy.

6 0

2 years ago

How do you find the perimeter of a triangle?

vazorg [7]

To find the perimeter of a polygon, take the sum of the length of each side. The formula for perimeter of a triangle would be the sum of the three side lengths (a +b+c). In the case, where it is a regular polygon, the perimeter would be 3 times the side length. Hope this answers the question.

7 0

3 years ago