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suter [353]
3 years ago
12

Someone please help me with this problem!!! I really need help and I don’t understand it!! If you know it please explain how you

got your answer!! I need this by tomorrow!!

Mathematics
1 answer:
nikitadnepr [17]3 years ago
3 0
Distance = Rate * Time where the asterisk represents multiplication

We can isolate the rate if we divide both sides by the time. So we'll end up with this formula
Rate = Distance/Time
which can be written as 
r = d/t

The distance is measured in feet while the time is measured in minutes. The rate r is measured in feet per minute. If the speed was 10 feet per minute, then this would mean that the object travels 10 feet every minute. Or put another way, when one minute passes by, the object has traveled 10 feet.

How did I get "feet per minute" from the equation r = d/t? 
Well the units for "d" are in feet, and the units for "t" are in minutes

So writing "d/t" would turn into "feet/minute" when we think of the units only (ignore the actual numbers). Then we rewrite "feet/minute" into "feet per minute" as they mean the same thing, just written different ways. 

-----------------------------------------------------

Answer: The units for the speed or rate are in feet per minute
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Find the discriminant and determine the nature of the roots to the quadratic equation
Katen [24]
№17
x^{2} +6x-7=0 \\ D=6 ^{2} -4*(-7)=36+28=64=8 ^{2}  \\  \\  x_{1} = \frac{-6+8}{2} =1 \\  \\  x_{2} = \frac{-6-8}{2} =-7
Answer: x₁ = 1
               x₂ = - 7

№18
2 x^{2} -3x+4=3 \\ 2 x^{2} -3x+4-3=0 \\ 2 x^{2} -3x+1=0 \\  \\ D= -3 ^{2} -4*2=9-8=1 \\  \\  x_{1} = \frac{3+1}{2*2} = \frac{4}{4} =1 \\  \\  x_{2} = \frac{3-1}{2*2} = \frac{2}{4} =0.5
Answer: x₁ = 1
               x₂ = 0,5.

№19
2 x^{2} -4x-5=0 \\  D=-4 ^{2} -4*2*(-5)=16+40=56 \\  \\  x_{1}= \frac{4+ \sqrt{56} }{2*2}  = \frac{4}{4} + \sqrt{ \frac{56}{16} } =1+ \sqrt{3.5}  \\  \\  x_{2} = \frac{4- \sqrt{56} }{2*2} = \frac{4}{4} -  \sqrt{ \frac{56}{16} } =1- \sqrt{3.5} 

Answer: x₁ = 1 + √3.5
               x₂ = 1 - √3.5

3 0
4 years ago
Can i have help with this?
Svetllana [295]

Answer:

<h3>81.</h3>

Step-by-step explanation:

**Whenever you see a variable and a coefficient together, multiply them.**

6x^2(x=1.5)

(6*1.5)^2 =9^2

9^2=81.

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What compatible numbers would you pick to estimate the difference of 777-248?why
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I would pick 750 - 250 because that equals 500. You can also prefer using 800 - 250.
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Answer: 720

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this shape is half of that though, so we do 1440/2= 720, so the answer is 720

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3 years ago
If the product ab is 0, then either a or b must be
algol [13]
0 because 0 times anything is 0
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