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pickupchik [31]
3 years ago
13

How to Subtract this and put in Standard form?

Mathematics
1 answer:
krek1111 [17]3 years ago
4 0

Answer:

-12a2 + 9a - 5

Step-by-step explanation:

the 2 should be small

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An object is launched from ground level with an initial velocity of 120 meters per second. For how long is the object at or abov
babunello [35]

Answer:

D) 14 seconds

Step-by-step explanation:

First we will plug 500 in for y:

500 = -4.9t² + 120t

We want to set this equal to 0 in order to solve it; to do this, subtract 500 from each side:

500-500 = -4.9t² + 120t - 500

0 = -4.9t²+120t-500

Our values for a, b and c are:

a = -4.9; b = 120; c = -500

We will use the quadratic formula to solve this.  This will give us the two times that the object is at exactly 500 meters.  The difference between these two times will tell us when the object is at or above 500 meters.

The quadratic formula is:

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

Using our values for a, b and c,

x=\frac{-120\pm \sqrt{120^2-4(-4.9)(-500)}}{2(-4.9)}\\\\=\frac{-120\pm \sqrt{14400-9800}}{-9.8}\\\\=\frac{-120\pm \sqrt{4600}}{-9.8}\\\\=\frac{-120\pm 67.8233}{-9.8}\\\\=\frac{-120+67.8233}{-9.8}\text{ or }\frac{-120-67.8233}{-9.8}\\\\=\frac{-57.1767}{-9.8}\text{ or }\frac{-187.8233}{-9.8}\\\\=5.3242\text{ or }19.1656

The two times the object is at exactly 500 meters above the ground are at 5 seconds and 19 seconds.  This means the amount of time it is at or above 500 meters is

19-5 = 14 seconds.

6 0
3 years ago
1274+3599 make a ten or a hundred to add mentally
VladimirAG [237]
Well the answer to 1274 plus 3599 = 4873. but I don't know what you are asking for?
6 0
3 years ago
Read 2 more answers
What is 5.5 written as a fraction in simplest form
julia-pushkina [17]
5.5 as a fraction is 11/2
6 0
3 years ago
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How many gallons of gas did Randy use to drive 189 miles?
Gnesinka [82]

Answer:

i think around 10 gallons. im not sure though,

Step-by-step explanation:

7 0
3 years ago
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Please help, basic algebra. Find the value of x
Naily [24]

Answer:

<em>76 degrees</em>

Step-by-step explanation:

The corresponding angles help you solve this.

The vertical angle of x (meaning the one practically in front of it) is 76 degrees, since x is vertical to 76, the degree will be the same.

8 0
3 years ago
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