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S_A_V [24]
3 years ago
12

Evaluate the following expression, when x=-22x^2+4x-3A) 3B) 3C) -19D) 9​

Mathematics
2 answers:
Korolek [52]3 years ago
7 0

Answer:

Sana makatulog po Ito sa inyo.

pishuonlain [190]3 years ago
4 0

Answer:

-3

<h3>explanation;..!!^=^</h3>

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Can someone check my answers and if their wrong explain how to get the correct answer
Charra [1.4K]

Answer: 1. Correct, 2. Incorrect 90° angle not 80° angle answer is 50, 3. Is correct, 4. Is correct

Step-by-step explanation:

8 0
3 years ago
Can anyone help me please?
miss Akunina [59]

Answer:

  5. -18x^3y^4 +54x^2y^4

  6. 6x^2 -40x +50

Step-by-step explanation:

Use the distributive property. The factor outside parentheses multiplies each term inside parentheses.

__

<h3>5.</h3>

  (9xy)(-2x^2y^3+6xy)=(9xy)(-2x^2y^3)+(9xy)(6xy^3)\\\\=\boxed{-18x^3y^4+54x^2y^4}

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<h3>6.</h3>

  (3x-5)(2x-10)=3x(2x-10)-5(2x-10)\\\\=6x^2-30x-10x+50=\boxed{6x^2-40x+50}

7 0
2 years ago
2a+ 4b +30<br><br><br> 16 points
oee [108]

Answer:

2(a+2b+15)

Step-by-step explanation:

hope this helps!

8 0
3 years ago
There are 84 boys in a senior class of 146 students. find the ratio of boys to girls. (note: if you know the total number of stu
vladimir1956 [14]
84 to 62. You have to subtract 146-84 to get the number of girls from the class.
4 0
3 years ago
How do you do series with an n
SOVA2 [1]
The problem can be solved step by step, if we know certain basic rules of summation.  Following rules assume summation limits are identical.
\sum{a+b}=\sum{a}+\sum{b}
\sum{kx}=k\sum{x}
\sum_{r=1}^n{1}=n
\sum_{r=1}^n{r}=n(n+1)/2

Armed with the above rules, we can split up the summation into simple terms:
\sum_{r=1}^n{40r-21n+8}=n
=40\sum_{r=1}^n{r}-21n\sum_{r=1}^n{1}+8\sum_{r=1}^n{1}
=40\frac{n(n+1)}{2}-21n^2+8n
=20n(n+1)-21n^2+8n
=28n-n^2

=> (a) f(x)=28n-n^2
=> f'(x)=28-2n 
=> at f'(x)=0 => x=14
Since f''(x)=-2 <0  therefore f(14) is a maximum
(b) f(x) is a maximum when n=14

(c) the maximum value of f(x) is f(14)=196
4 0
3 years ago
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