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4 years ago

I have another question as well!

Mathematics

1 answer:

vampirchik [111]4 years ago

5 0

You need to simplify 3(2x-5) which would make it 6x-15 on the bottom.
Then take 4x + 3 in and multiply it by 6x - 15 to get the area.

PERIMETER= 8x + 6 + 12x - 30
= 20x - 24

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the larger of two numbers is six less than twice the smaller number. if the sum of the number is 42 , find the number

USPshnik [31]

42-6=? (Answer) 36

I have to write 20 characters

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3 years ago

HELPPP!!!! please i need two more brainliest,help?

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3 years ago

Find the area of the figure with Heron’s formula

Anna11 [10]

Answer:

735 cm²

Step-by-step explanation:

The figure is a trapezium .The area of the triangle section can be calculated using the Heron's formula.

The other part of the figure will be a square of sides 21 cm by 21 cm

<u>Area of the square section</u>

Area = l²

Area = 21* 21 = 441 cm²

<u>Area of the triangle using Heron's formula</u>

Sides of the triangle are ;

a= 28 cm

c= 35 cm

b = 21 cm -----height of the trapezium

The Heron's formula is given as;

$A=\sqrt{s( s-a)(s-b )(s-c )}$

where s is half the perimeter of the triangle

Perimeter of the triangle is given as ;

P= 35 + 28 + 21 =84 cm

s= 84/2 = 42 cm

$A=\sqrt{42*(42-21 )*(42-35 )*(42-28 )} \\\\A=\sqrt{42*(21 )*(7 )*( 14)} \\\\A=\sqrt{86436} \\\\A=294\\\\$

Total area = 294 + 441 = 735 cm²

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3 years ago

The lengths of text messages are normally distributed with a population standard deviation of 4 characters and an unknown popula

umka21 [38]

Answer:

The answer is " $(25.32, 30.68)$ "

Step-by-step explanation:

Given:

$\bar x = 28\\\\ \sigma = 4\\\\n =26\\\\$

When $98\%$ confidence level so, the z:

$\alpha = 1 - 98\% = 1 - 0.98 = 0.2\\\\\frac{\alpha}{2} =\frac{0.02}{2} = 0.01\\\\Z_{\frac{\alpha}{2}} = Z_{0.01} = 1.645\ \ \ ( Using \ z \ table )\\\\$