Answer:
b = 6
Step-by-step explanation:
Step 1: Write equation
-2.6b + 4 = 0.9b - 17
Step 2: Solve for <em>b</em>
<u>Add 2.6b on both sides:</u> 4 = 3.5b - 17
<u>Add 17 on both sides:</u> 21 = 3.5b
<u>Divide both sides by 3.5:</u> b = 6
Step 3: Check
<em>Plug in x to verify if it's a solution.</em>
-2.6(6) + 4 = 0.9(6) - 17
-15.6 + 4 = 5.4 - 17
-11.6 = -11.6
Answer:
489.84 m²
Step-by-step explanation:
Area of one 2d circle: πr² ⇒ π6² ⇒ 36π ≈ 113.04 (using 3.14 for pi)
Area of both 2d circles: 113.04 + 113.04 =226.08 m²
Now we have to find the width of the rectangle, which is equal to the circumference of either circle:
Width of rectangle: 2πr ⇒ 2π6 = 12π ≈ 37.68 (using 3.14 for pi)
We can find the area of the rectangle now, since the length was given
Area of rectangle: 37.68· 7= 263.76 m²
Surface Area: 263.76+226.08= 489.84m²
Hopefully this helps!
This is the number of combinations of 2 from 23
23C2 = 23! / 2! 21!
A quick way to do this is 23*22 / 2 = 253
Answer:
Step-by-step explanation:
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