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densk [106]
3 years ago
13

Please help me I don’t remember how to do it

Mathematics
2 answers:
MakcuM [25]3 years ago
8 0
The answer is gonna be A
icang [17]3 years ago
6 0
In this problem, you must change the signs of everything in the parenthesis, which will come to 3x^2 + x - 5x^2 - x + 4. Add like terms, and you will end up with -2x^2 + 4, which is answer choice A. Hope this helped
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What is the approximate area of the regular pentagon?
Anastasy [175]

Area of the pentagon: 342 cm2

Step-by-step explanation:

The figure of the pentagon is missing: find it in attachment.

The area of the pentagon can be seen as the area of 5 equal triangles, each of them having a base equal to the length of the side of the pentagon,

L = 14.1 cm

and the height of each triangle can be found by using Pythagorean's theorem:

h=\sqrt{12^2-(\frac{L}{2})^2}=\sqrt{12^2-(\frac{14.1}{2})^2}=9.7 cm

The area of each of the 5 triangles is

A'=\frac{1}{2}Lh

Therefore, the area of the pentagon is 5 times this area:

A=5A'=\frac{5}{2}Lh=\frac{5}{2}(14.1)(9.7)=342 cm^2

Learn more about area of regular figures:

brainly.com/question/4599754

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brainly.com/question/6564657

#LearnwithBrainly

7 0
3 years ago
Read 2 more answers
How to check that a number is divisible by 3 or not?? Need a best shortcut!!
Lilit [14]
If your number is quite large, like 3 digit or higher than that, then calculate the sum of their digits, if they will be divisible by 3, then the number is divisible, otherwise not.

For example. - "11055" 
Here, sum of digits = 1 + 1 + 0 + 5 + 5 = 12
As 12/3 = 4 (Divisible)

In short, This number would be divisible.

Hope this helps!
5 0
4 years ago
Read 2 more answers
6/2-(5-4)+2(8-2/2)÷8
Firdavs [7]

Answer:

3\frac{3}{4}=\frac{15}{4} =3.75

Step-by-step explanation:

Hope this helps.

7 0
3 years ago
we would multiply the divisor and dividend of 1.44 / 1.2 by what number to make the divisor a whole number
kaheart [24]
To make the divisor and the dividend a whole number they bothneed to be multiplied by 100
8 0
3 years ago
Find the midpoint of AB given A (-1,4) and B (7,6)
lutik1710 [3]
Seriously: add the x's divide by 2, add the y's divide by 2, bob's your uncle. you have the midpoint. 
8 0
4 years ago
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