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Margarita [4]
3 years ago
11

PLEASE HELP!!!

Mathematics
1 answer:
Rudiy273 years ago
6 0
By finding the derivative of that equation, we can find the least value. Derivative will give us
v'=(20.8 x^{2} -458.3x+3500)'
41.6x-458.3. Setting this to zero we find that x≈11.017

Alternatively, we can find the vertex coordinates of that equation. And again we'll get the same result. In the attached picture, you can see this result much more clearly. 

Finally, the year is going to be 1985

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2. Write (2+5i)(3-1) as a complex number in standard form a+bi.<br> real part + imaginary part
Burka [1]

Answer:4+10i

Step-by-step explanation:

6+15i-2-5i

4+10i

5 0
3 years ago
What is the answer??
denis-greek [22]

Answer:

10a²+5ab+2b²

Step-by-step explanation:

Start by combining like terms aka the ones that match:

Step 1: (4a²-5ab-6b²) + (10ab+6a²+8b²)

Step 2: (10a²-5ab-6b²) + (10ab+8b²)

Step 3: (10a²+5ab-6b²+8b²)

Final answer: 10a²+5ab+2b²

In step 1, I added the 4 and 6. In step 2, I added -5 and 10. In step 3, I added -6 and 8. For each I attached the proper ending (a², ab, and b²).

I hope this clears some confusion!

3 0
3 years ago
Multiplying and factoring polynomial expressions (9th grade)
lutik1710 [3]

Answer:

1. 2(a^2 + 3a + 9)

2. 5(x^2 - 1)

3. 3(t + 8)(t - 2)

4. n(4 - n)

Step-by-step explanation:

For 1, you can only factor out the constant from each.

For 2, you can also only factor out the constant, but remember that you include the 1 when dividing 5 by 5.

For 3, you can factor out the constant and the variables.

For 4, you can only factor out the variable.

5 0
2 years ago
Find the area and permimeter
defon

Answer:

Area: 18x² + 63x

Perimeter: 22x + 14

8 0
3 years ago
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Step-by-step explanation:

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