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ASHA 777 [7]
3 years ago
12

:

Mathematics
1 answer:
8_murik_8 [283]3 years ago
6 0

Answer:

18.95(0.3+0.1)

Step-by-step explanation:

Add the parenthesis and then multiply it to the cost to get the answer

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Someone please be awesome and help me please :(
solong [7]

Answer:

(x+\frac{b}{2a})^2+(\frac{4ac}{4a^2}-\frac{b^2}{4a^2})=0

(x+\frac{b}{2a})^2=\frac{b^2-4ac}{4a^2}

x=\frac{-b}{2a} \pm \frac{\sqrt{b^2-4ac}}{2a}

Step-by-step explanation:

x^2+\frac{b}{a}x+\frac{c}{a}=0

They wanted to complete the square so they took the thing in front of x and divided by 2 then squared.  Whatever you add in, you must take out.

x^2+\frac{b}{a}x+(\frac{b}{2a})^2+\frac{c}{a}-(\frac{b}{2a})^2=0

Now we are read to write that one part (the first three terms together) as a square:

(x+\frac{b}{2a})^2+\frac{c}{a}-(\frac{b}{2a})^2=0

I don't see this but what happens if we find a common denominator for those 2 terms after the square.  (b/2a)^2=b^2/4a^2 so we need to multiply that one fraction by 4a/4a.

(x+\frac{b}{2a})^2+\frac{4ac}{4a^2}-\frac{b^2}{4a^2}=0

They put it in ( )

(x+\frac{b}{2a})^2+(\frac{4ac}{4a^2}-\frac{b^2}{4a^2})=0

I'm going to go ahead and combine those fractions now:

(x+\frac{b}{2a})^2+(\frac{-b^2+4ac}{4a^2})=0

I'm going to factor out a -1 in the second term ( the one in the second ( ) ):

(x+\frac{b}{2a})^2-(\frac{b^2-4ac}{4a^2})=0

Now I'm going to add (b^2-4ac)/(4a^2) on both sides:

(x+\frac{b}{2a})^2=\frac{b^2-4ac}{4a^2}

I'm going to square root both sides to rid of the square on the x+b/(2a) part:

x+\frac{b}{2a}=\pm \sqrt{\frac{b^2-4ac}{4a^2}}

x+\frac{b}{2a}=\pm \frac{\sqrt{b^2-4ac}}{2a}

Now subtract b/(2a) on both sides:

x=\frac{-b}{2a} \pm \frac{\sqrt{b^2-4ac}}{2a}

Combine the fractions (they have the same denominator):

x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}

6 0
3 years ago
A camp needs 100 students to help with 4-year-old campers. Eight students from 4 different classes have agreed to help. How many
dimaraw [331]

Answer: 32 students

Step-by-step explanation: 8 x 4 = 32  

4 0
3 years ago
18 is what percent of 40
marshall27 [118]

Answer:

45%

Step-by-step explanation:

Create a fraction with the of " something " on the denominator and multiply by 100% to create the percentage, that is

percent = \frac{18}{40} × 100% = 45%

7 0
3 years ago
Read 2 more answers
A line passing through the point (7, 6) has a slope of 2.
Masja [62]
An equation in point-slope form is
y - y1 = m (x - x1)

Your point is (7,6) and your slope is 2
y1 is the y coordinate of your point (in this case 6)
x1 is the x coordinate of your point (in this case 7)
m is your slope (in this case 2)

Now you just have to plug these numbers in:
y - 6 = 2 (x - 7)
8 0
3 years ago
2 096 to the nearest 1000
k0ka [10]
The answer to this is 2000...
hope this helps and HAGD!
6 0
3 years ago
Read 2 more answers
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