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zhannawk [14.2K]
2 years ago
7

-7_-4 what is the answer plz help

Mathematics
1 answer:
AlexFokin [52]2 years ago
5 0

the answer is

<

because the -4 is less than -7

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Simplify the expression completely. 7b+3(4b−2)+6÷3
Karo-lina-s [1.5K]

Answer:

19b-4

Step-by-step explanation:

7b+3(4b-2)+6÷3

Bracket comes first so we distribute 3 over the terms in the bracket

= 7b + 12b -6 +6 ÷ 3

First we solve division

= 7b + 12b -6 +6 ÷ 3

= 7b + 12b -6 +2

= (7b+12b)+(-6+2)

= 19b -4

This can't be simplified further as it can't be solved anymore

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3 years ago
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A hiker travels 45 degrees north of east for 30 km. What is his NORTH (or y) displacement component? Round your answer and inclu
miv72 [106K]

consider X-axis along the east-west direction and north-south direction along Y-axis

A = magnitude of distance traveled by hiker in north-east direction = 30 kilometer

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A' = component of distance traveled by the hiker along the east direction.

Since the angle is given with the x-axis, the Sin provides the component in Y-direction. hence

Using the equation

A' = A Sinθ

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A' = (30) Sin45

A' = 21.2 km

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3 years ago
Write y=-3x^2+12x-21 in vertex form
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Complete the square: 
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<span>y = 3(x^2 - 4x + 4 - 4) + 4 </span>
<span>y = 3(x^2 - 4x + 4) - 12 + 4 </span>
<span>y = 3(x - 2)^2 - 8</span>
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Can you guys help me on question 8 and 9 :)
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Answer:

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2 years ago
What is the frequency of a wave that has a wave speed of 30 m/s and a wavelength of 0.60 m?
maksim [4K]

Answer:

wave length = 30/6 = 5m

Step-by-step explanation:

wave travels 30m in one second.

wave completes 6 cycles in one second.

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3 years ago
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