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monitta
3 years ago
13

What’s the area of a circle to the nearest square foot with the radius of 7000 use 3.14 for pie

Mathematics
1 answer:
yawa3891 [41]3 years ago
7 0
Pi*r^2
3.14*7000^2
153,860,000
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Using the triangle below, set up and solve an equation in order to find the value of x.
Colt1911 [192]

Answer:

90+15x+8x-2=180

Step-by-step explanation:

answer is 4

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2 years ago
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Given the relationship x2 + 3y2 =12, with y > 0 and dx, dt = 2 units/min., find the value of dy, dt at the instant y = 1 unit
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\bf x^2+3y^2=12\implies \stackrel{chain~rule}{2x\cfrac{dx}{dt}}+3 \stackrel{chain~rule}{\left(2y\cfrac{dy}{dt}\right)}=0
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2x\cfrac{dx}{dt}+6y\cfrac{dy}{dt}=0
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x^2=9\implies x=\sqrt{9}\implies x=3\\\\
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\begin{cases}
y=1\\
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7 0
3 years ago
(-2x+3y=8....(i)<br>( x+y=2.........(ii)<br>solve by elumination method and substitution​
yan [13]

Answer:

 x = -2/5

 y = 12/5

Step-by-step explanation:

Substitution method;

-2x + 3y = 8  -----------(i)

x + y =2   -----------(ii)

x = 2 - y

substitute the value of x in equ (i)

  (-2)* (2-y) + 3y = 8

     -4 + 2y + 3y = 8

                   5y = 8 + 4

                     y = 12/5

substitute the value of y in equ (ii)

x + 12/5 = 2

        x = 2 - 12/5

           = 2*5/1*5 - 12/5  

          = 10 -12/5 = -2/5

Ans: x = -2/5

       y = 12/5

elimination method:

-2x + 3y = 8  -----------(i)

x + y =2   -----------(ii)

                                    (i)   ====>    -2x + 3y = 8

multiply equ (ii) by 2         ====>    <u>  2x + 2y = 4</u>

             add (i) and (ii)                             5y = 12

                                                                   y = 12/5

Substitute in equ (ii)

x + 12/5 = 2

        x = 2 - 12/5

           = 2*5/1*5 - 12/5  

          = 10 -12/5 = -2/5

Ans: x = -2/5

       y = 12/5

                                                       

               

5 0
3 years ago
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Math Help? Please! : )
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