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3 years ago

What is -3 (8x)+6(4x) ;x=2

Mathematics

2 answers:

Angelina_Jolie [31]3 years ago

8 0

Well since we know what x equals we can just plug that into the equation.

-3(8 * 2) + 6(4*2)

Do what is in parentheses first

-3(16) + 6(8)

-48 + 48

The negative and the positive end up canceling out to make this 0

shtirl [24]3 years ago

3 0

-3 (8x)+6 (4x) -3 (16)+6 (8) -48+48= 0

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Answer:

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For what values of x is x2+2x=24 true?

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$x=-6$ and $x=4$

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$x^2+2x-24=24-24$

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Now we factor the quadratic equation

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So the factors are:

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3 years ago

Tara bicycles 15 mph with no wind. Against the wind, she bikes 10 miles in the same time that it takes to bike 16 miles with the

wlad13 [49]

Answer:

3.46 mph

Step-by-step explanation:

Speed of Tara bicycling without wind effect = 15mph

let the speed of wind be x mph

If she cycles against the wind then her speed will be decrease by the amount as the speed of wind

Then,

Speed of Tara bicycling against wind effect = (15-x)mph

distance traveled by Tara against wind = 10 miles

we know that

time = distance by speed

time taken by Tara while traveling against wind = 10/(15-x)

_______________________________________________________

If she cycles with the wind then her speed will be increase by the amount as the speed of wind

Then,

Speed of Tara bicycling with wind effect = (15+x)mph

distance traveled by Tara w wit wind = 16 miles

time taken by Tara while traveling with wind = 16/(15+x)

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it is given that both the time are same

time taken by Tara while traveling with wind = time taken by Tara while traveling against wind

16/(15+x) = 10/(15-x)

=> 16(15-x)=10(15+x)

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=> x = 90/26 = 3.46

Thus, speed of wind is 3.46 mph.

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3 years ago