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notka56 [123]
3 years ago
11

Calculate the area of a circle with diameter of 6cm

Mathematics
1 answer:
Anastasy [175]3 years ago
3 0
Area of circle = pi times radius sqauared
Radius is from center of circle to edge
Diameter is from one side of circle to the other throygh center
Therefore radius is half the diameter
a = pi * 3^2 = 28.3cm^2 (3sf)
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An electrician cuts always a 7.2inch long section of drywall to make repairs to the electrical system.He has several scraps of d
Nadusha1986 [10]
7 5/21 I think that would be the one that can cover it but not have to much left. 


You might need a second opinion.
6 0
3 years ago
2.3×10⁹=(1×10³)(2.3×10^n)​
kotegsom [21]

Answer:

<em>n = 6 </em>

Step-by-step explanation:

2.3 × 10^{9} = (1 × 10³)(2.3 × 10^{n} )

(1 × 10³)(2.3 × 10^{n} ) = (1)(2.3) × (10³)( 10^{n} ) = 2.3 × 10^{3+n}

2.3 × 10^{3+n} = 2.3 × 10^{9} ⇒ 3 + n = 9 ⇒ <em>n = 6</em>

5 0
2 years ago
**MARKING BRAINLIEST PLEASE HELP**
raketka [301]

Answer:

\text{1. } v=16t+\frac{h-c}{t},\\\text{2. }90\:\mathrm{ft/s}, \\\text{3. Cannot be determined}

Step-by-step explanation:

1. The initial equation given to us is h=-16t^2+vt+c. Rearranging the equation to isolate v, we have:

vt=16t^2+h-c,\\\boxed{v=16t+\frac{h-c}{t}}

2. Using the equation we rearranged in part 1, we can substitute given values:

v=16(3)+\frac{131-5}{3},\\v=48+42=\boxed{90\:\mathrm{ft/s}}

3. We see from our equation in part 1 (v=16t+\frac{h-c}{t}) that when t=0, the denominator of our fraction will be equal to 0. Since we cannot divide by 0, the velocity remains undefined and cannot be determined.

3 0
2 years ago
Combine like terms 7a - a+ 16 = ?
dexar [7]
6a+16

Explanation:
If there's just a variable, there's an understood 1 in front of it. So what that really says is:

7a-1a+16

So, you combine the a's. 7a minus 1a is 6a. Same as 7-1,but you have a variable stuck on the end of it.

6a+16

:^)
4 0
3 years ago
Read 2 more answers
5(x – 4) + 3x – 9x = 6 - (2x + 5) + 8x
AURORKA [14]
This is what i got:
-x-20=6x+1
6 0
3 years ago
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