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LuckyWell [14K]
3 years ago
13

Simplify this 6r+3(2r+1)

Mathematics
2 answers:
SpyIntel [72]3 years ago
6 0

Answer: 12r + 3

Step-by-step explanation:

6r+3(2r+1)

Apply BODMAS, do bracket first

6r + (6r + 3)

Do addition next

= 12r + 3

prisoha [69]3 years ago
5 0

Answer:

6r + 3(2r+1)

6r+ 6r+3

12r + 3

3(4r+1)

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A model rocket is launched directly upward at a speed of 28 meters per second from a height of 12 meters. The function f(t) = -
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Answer:

6.11 seconds

Step-by-step explanation:

Given

f(t) = -4.9t^2 + 28t + 12

Required

When will it hit the ground?

When it hits the ground, f(t) = 0.

So, we have:

0 = -4.9t^2 + 28t + 12

Solve quadratic equation using formula

t = \frac{-b \± \sqrt{b^2 - 4ac}}{2a}

t = \frac{-28 \± \sqrt{28^2 - 4*-4.9*12}}{2*-4.9}

t = \frac{-28 \± \sqrt{1019.2}}{-9.8}

t = \frac{-28 \± 31.92}{-9.8}

Split

t = \frac{-28 + 31.92}{-9.8} or t = \frac{-28 - 31.92}{-9.8}

t = \frac{3.92}{-9.8} or t = \frac{-59.92}{-9.8}

t = -0.4 or t = 6.11

Time can not be negative. So:

t = 6.11

6 0
3 years ago
All the real square roots of 144.
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Answer:

So the set of all real square roots of -144 is the empty set. The imaginary square roots are i12 and -i12.

Step-by-step explanation:

hopefully that helps you

6 0
4 years ago
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Answer:

I THINK IT'S C!!!

Step-by-step explanation:

EDGE 2020

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