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qwelly [4]
3 years ago
8

Please help me Solve this quadratic: 5x^2-20x+10=0

Mathematics
1 answer:
konstantin123 [22]3 years ago
3 0
I usually solve them like this:
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A tree casts a shadow 36 ft long. At the same​ time, the shadow cast by a vertical 8​-ft post is 12 ft long. Find the height of
muminat
Let h=height. then h/36 = 8/12
12h=288
h=24 feet
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4 years ago
288 miles on 12 gallons
balu736 [363]
What operation is it?
3 0
3 years ago
a sprinter runs 400 meters in 54 seconds.What is the runners average running rate in meters per second?Round to the nearest tent
Novay_Z [31]
You want to find meters per second.
So meters goes over seconds
400 meters/54 seconds
Now pull out the calculator.
You should get ≈ 7.4  \frac{m}{s}, or 7.4 meters per second
8 0
3 years ago
The x-intercept of a line is 5 and its slope is 6. Which equation represents the line?
OLEGan [10]

Answer:

y=-5x+35

Step-by-step explanation:

Use the formula y = mx + b

m = slope, so plug in -5 as the slope

To find x-intercept we set y=0

We want the x-intercept to be 7 so we can plug that into the equation too

0=-5(7)+b

4 0
3 years ago
How to substitute 3x+3y=-3 and y=5x-1?
schepotkina [342]
Since y = 5x-1, we can fill it into 3x + 3y = -3. First, let's look at relating to a simpler equation. Let's say that x + y = 9 and y = 3 + 5. Now, we can fill it in to get that x + (3 + 5) = 9. Now, we know that 3+5 is 8, so x + 8 = 9. Now, x = 1. Likewise, we can do the same. For 3x + 3y = -3, all we need to do is to switch the y in 3x + 3y = -3 with 5x - 1. So it would become 3x + 3(5x - 1) = -3. Now we distribute to get 3x + 15x - 3 = -3. Now add three to both sides to get 3x + 15x = 0. Now simplify to get 18x = 0. Now we know that x = 0. Now fill x into y = 5x - 1. So y = 5(0) - 1. Now we know that y = -1.

To check fill in the answer to 3x + 3y = -3.
3(0) + 3(-1) = -3
 0 + (-3) = -3
0 - 3 = -3
-3 = -3
Now that our check is completed we now know that x is 0 and y is -1.
7 0
4 years ago
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