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lutik1710 [3]
3 years ago
13

Find the sum of the first20 odd numbers.​

Mathematics
2 answers:
konstantin123 [22]3 years ago
7 0

Answer:

Hi there.....

Step-by-step explanation:

This is ur answer......

1, 3, 5, 7, 9, 11, 13, 15.................39

Therefore the total sum = 400

hope it helps you,

mark me as the brainliest....

Follow me......

geniusboy [140]3 years ago
3 0

Answer:

400

Step-by-step explanation:

These are the first 20 odd numbers

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23 + 25 + 27 + 29 + 31 + 33 + 35 + 37 + 39

Put them in a calculator and you get: 400

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36=xsquared minus x divided by 2
Furkat [3]

Answer:

4.5 orrr -4

Step-by-step explanation:

6 0
3 years ago
Does anyone know how to answer this question? Please write your working calculation as well if you do know the answer. Thanks so
krek1111 [17]

Answer:

Mark as brainliest if helped Thanks!

Step-by-step explanation:

funtion is:

y = \frac{x^2 -1}{2x + 1}

therefore \\\frac{dy}{dx}\\ is

\frac{d\frac{x^2 -1}{2x + 1}}{dx}

\frac{\frac{x^2 -1}{2x + 1}}{x}

\frac{x^2 -1}{(2x+1) x}

Now

\int\limits^2_0 {\frac{x^2 +x +1 }{4x^2 +4 + 1} } \, dx

(Calculation of this it too long and it is hard to type on brainly)

here is the answer though....

= 4/5

=0.8

5 0
3 years ago
Pls serious help asap asap pls !
Hunter-Best [27]

Answer: option B is correct

Step-by-step explanation:

The formula for determining the area of cross section of a trapezoid is expressed as

Area = 1/2(a + b)h

Where

a and b are the length of The bases are the 2 sides of the trapezoid which are parallel with one another.

h represents the height of the trapezoid.

From the information given,

a = h1 = 11 inches

b = h2 = 15 inches

If It has an area of 52 inches² , then

52 = 1/2(11 + 15)h

Cross multiplying by 2, it becomes

52 × 2 = (11 + 15)h

104 = 26h

h = 104/26 = 4 inches

5 0
4 years ago
A model car is 7.5 inches long made with a scale of 2 inches = 48 inches. How long is the actual car?
vitfil [10]

Answer:

I'm pretty sure its 180 !!

8 0
3 years ago
A carpenter cuts a 5 feet 11 inch piece of board from a 10 feet 9 inch piece. What is the
Vikentia [17]

Answer:

4 feet and 9 inches

Step-by-step explanation:

first you want to take the 11 inches from the 9 but you can't so you would take the 3 missing inches from the 10 foot and that would make it 9 feet and 9 inches

then take 5 from the left over 9 and that is 4 so your answer would be 4 feet and 9 inches

4 0
3 years ago
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