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7nadin3 [17]
3 years ago
10

In 30 seconds, 2-year-old Janay's heart beats 36 times.

Mathematics
2 answers:
Elis [28]3 years ago
8 0

Answer: 144 times

Step-by-step explanation:

In 30 seconds , it beats 36 times

Another 30 seconds - 36 times

Another 30 seconds - 36 times

Another 30 seconds - 36 times

Therefore , in two minutes , it will beat , 36 + 36 + 36 + 36 times

Therefore , it will beat 144 times .

Another Approach

30 Seconds - 36 times

1 second - 36/30 times

Since 120 seconds make 2 minutes , then

120 seconds - 36/ 30 x 120

= 144 times

skelet666 [1.2K]3 years ago
3 0

Answer: 144 beats

Step-by-step explanation

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aivan3 [116]

Hello and Good Morning/Afternoon

<u>Let's take this problem step-by-step</u>:

<u>To find the solution to a system of equation</u>

  ⇒ <em>must set</em> the equations equal to each other

     ⇒ and solve

<u>Let's put that into action</u>

  x^2-2x+3 = -2x + 12\\x^2-2x+2x+3-12=0\\x^2-9=0\\(x+3)(x-3)=0

  • At this point, to make the whole thing equal zero

          ⇒ either 'x+3' or 'x-3' equals zero

              ⇒ must find 'x' that satisify either equation

                    x-3=0\\x=3\\\\x+3=0\\x=-3

<u>Let's find the corresponding f(x) to each x-value</u>

  f(3) = -2(3)+12=-6+12 = 6\\\\f(-3) = -2(-3) + 12=6+12=18

<u>Therefore the solutions are (3,6) and (-3,18)</u>

<u />

<u>Answer: (3,6), (-3,18)</u>

<u></u>

Hope that helps!

#LearnwithBrainly    

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2 years ago
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