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2 years ago

(Please help HURRY!) (Don't delete this!) (I WILL GIVE BRAINY!)

Mathematics

2 answers:

DanielleElmas [232]2 years ago

6 0

area of triangle is = 1/2 * base * altitude

1- each side is made 8 times

so the net change in area is 64 times

The area of A'B'C' is 64 times the area of ABC

2- each side is made 4 times

so the net change in area is 16 times

The area of D'E'F' is 16 times the area of DEF

3- each side is made 3 times

so the net change in area is 9 times

The area of A'B'C' is 9 times the area of ABC

ipn [44]2 years ago

4 0

1. A or B

2. C

3. I think B

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Find the sum −1/2(7z+4)+15(5z−15)

sattari [20]

Answer: $\frac{143x - 453}{2}$

Step-by-step explanation:

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2 years ago

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Find the sum of the counting numbers from 1 to 25 inclusive. In other words, if S = 1 + 2 + 3 + ... + 24 + 25, find the value of

Anastaziya [24]

Answer:

325

Step-by-step explanation:

You must have heard about Arithmetic Progressions (AP)

Arithmetic progressions are a series of numbers such that every successive number is the sum of a constant number and the previous number.

Our very own counting numbers form AP

For example :-

2 = 1 + 1

3 = 2 + 1

4 = 3 + 1

The number in bold (1) is that constant number which is added to a number to form its successive number.

To find the sum of series forming AP, we use the formula :-

$sum = \frac{n}{2} \{ a + a _{n} \}$

here,

n is the number of terms
a is the first number of the series
an is the last number of the series

So we'll use all this information to find the sum of continuous numbers from 1 to 25 where 1 is the first term(a) and 25 is the last(an).

and n is 25

$S = \frac{25}{2}\{ 1 +25\}$

$= \frac{25 \times 26}{2}$

$= 25 \times 13$

$= 325$

So, the value of S comes out to be 325.

8 0

2 years ago

Read 2 more answers

Help with this please.

spin [16.1K]

The answer would be because

7 0

2 years ago

Make b the subject of the formula P=2a+b

Gelneren [198K]

In order to make b the subject of this equation, we must isolate it on the left side. We can do this by following these steps:

$P = 2a+b$

Subtract b from both sides

$P - b = 2a+b-b$

$P-b=2a$

Subtract P from both sides

$P-b-P=2a-P$

$-b=2a-P$

Now, we have isolated b, but it is negative. We can fix this by multiplying both sides of the equation by -1.

$-(-b)=-(2a-P)$

$b=-2a+P$

Which is your final answer.
$b = -2a+P$ .
Hope that helped! =)

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2 years ago

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Expand the expression. 2/7(2s+3)

Mrrafil [7]

$\frac{2}{7} (2s + 3) \\ \frac{4s}{7} + \frac{6}{7} \\ \frac{4s + 6}{7}$

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2 years ago