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3 years ago

Help please with this math

Mathematics

2 answers:

Slav-nsk [51]3 years ago

6 0

1) 172.543

2) 24.649

3) 473.2608

4) 157

5) 100.48

6) 692.37

(idk if u wanted it rounded)

the formula is=

Full circle- pi(r)^2

Half circle- pi(r)^2÷2

IrinaK [193]3 years ago

5 0

Answer:

Step-by-step explanation: I will do 1, 2, 3, and 4 but its the same concept for all

First, the formula for the area of a circle is πr² (r = radius)

To find radius, we have to divide the diameter by 2. Now lets plug in our numbers

πr²

3.14 · 17.5 ²

3.14 · 306.25

Area of 1. is 961.6 in²

This is already the radius, so we simply plug in our numbers

πr²

3.14 · 2.5²

3.14 · 6.25

Area of 2. is 19.625 m²

πr²

3.14 · 48²

3.14 · 2304

Area of 3. is 7234.56 mm²

4. Now, this one is a semicircle, so it may seem hard, but all we have to do is divide the area by 2

First, convert the diameter. So now lets plug it in

πr²

3.14 · 10²

3.14 · 100

314 / 2

Area of 4. is 157 in²

I hope this helps you :)

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-4(6x+3)= -12(x+ 10)

Lilit [14]

Answer:

Step-by-step explanation:

-4(6x+3)= -12(x+10)

Let's do the first part:

-4(6x+3)

**distribute**

-4 x 6x = -24x; -4 x 3 = -12 ->>> -24x - 12

Let's do the second part:

-12(x+10)

**distribute**

-12 x x = -12x; -12 x 10 = -120 ->>> -12x -120

-24x -12 = -12x - 120

**Move variable to the left-hand side and change its sign**

-24x +12x -12 = -120

-12x - 12 = -120

-12x = 108

x = 108/-12

x=9

3 0

4 years ago

A neighborhood development that is 4 acres is to be divided into 2/3 acre lots. How many lots can be created?

mihalych1998 [28]

6 lots can be created

Solution:

Given that neighborhood development that is 4 acres is to be divided into $\frac{2}{3}$ acre lots

To find: number of lots created

From given information,

Total acres = 4

one lot = $\frac{2}{3} \text{ acres }$

So number of lots created can be found by dividing the total acres by acre of 1 lot

Thus the formula is:

$\text{ Number of lots } = \frac{\text{ total acres }}{\text{ acre of 1 lot }}$

Substituting the values we get,

$\text{Number of lots } = \frac{4}{\frac{2}{3}} = 4 \times \frac{3}{2} = 6$

Thus 6 lots can be created

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irinina [24]

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The polar coordinate would be (4, 5PI/6)

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