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nydimaria [60]
3 years ago
5

PWEASE HELP ME!!! I NEED IT ASAP!! ILL GIVE BRAINLIEST

Mathematics
1 answer:
Sati [7]3 years ago
8 0

Answer:

4/5 times a number Plus 8 answer=b

cuz if you because it says 4 / 5 which would be X so you have to do for as 5 as fraction and then you have to multiply it

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Sofia hits a softball straight up. the equation h= -16t^2 + 90t models the height h, in feet, of the ball after t seconds. How l
andrezito [222]
It is in the air 5.625 seconds.

Using the quadratic formula,

t=\frac{-b\pm \sqrt{b^2-4ac}}{2a}
\\
\\=\frac{-90\pm \sqrt{90^2-4(-16)(0)}}{2(-16)}
\\
\\=\frac{-90\pm \sqrt{8100-0}}{-32}
\\
\\=\frac{-90\pm \sqrt{8100}}{-32}=\frac{-90\pm90}{-32}
\\
\\=\frac{-90+90}{-32}\text{ or }\frac{-90-90}{-32}=\frac{0}{32}\text{ or }\frac{-180}{-32}
\\
\\=0\text{ or }5.625

0 is when the ball is first launched, 5.625 is when it hits the ground again.
4 0
3 years ago
Sophie says that if the interior angle of a triangle is 65 degrees and the exterior one is 295 degrees. Comment on her thinking
Yuri [45]
Sophie is correct because 295 + 65 = 360 and 360 is the # of degrees in a full circle
5 0
3 years ago
What is the standard deviation of the following data set 1,1.2,4,1.28,4.1,5.3?
VikaD [51]
Memorize the definition of standard deviation: the sd is the square root of the average of the squared deviations of the mean. Wow. Let's do it.

Step 1. First we need the mean. That's easy. Add them up and divide by the count. Check if you get 16.88/5 = 2.81333.

Step 2. Now we're going to subtract this from each of the values, and square the result. Don't worry about negative signs, the squaring will get rid of those. Example for the first number:

(1 - 2.813)^2 = 3.29

The list of numbers I get is (rounded, in reality round as little as possible):

3.29, 2.60, 1.41, 2.35, 1.66, 6.18

Step 3: Add them all up. I get 17.49. 
Step 4: Divide by the count of numbers. 17.49/6 = 2.91
Step 5: Take the square root from this result. SQRT(2.91) = 1.707305

TIP: Use excel to do all these steps, then run the set of numbers through Excel's built-in sd function (called  STDEV.P) and see that you get the same result!
3 0
3 years ago
Luke delivered 225 circulars on traft street 134 on 87th street 218 on roosevelt street and 229 on jones circle. how many did he
11111nata11111 [884]
225+134+218+229=806 circulars
6 0
3 years ago
Read 2 more answers
If u see this forget it, I typed it in the wrong spot
Arte-miy333 [17]
Ok then um so ya ok thx for the points though
4 0
3 years ago
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