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3 years ago

12

PLEASE HELP IF YOU CAN EXPLAIN IT THAN THATD BE AMAZINGGGGGG I don’t know which to pick I’m stuck

2 answers:

GaryK [48]3 years ago

5 0

Answer:

1st box ... can be the answe

Vlada [557]3 years ago

5 0

If you are multiplying exponents with the same base number, you can add the exponents. so in your example it would be 5^-3. then, when you have a negative exponent you have to take the reciprocal of it. the reciprocal of just flipping the top and bottom of a fraction. so it would be 1/5^3. i hope this helps!

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Answer:

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3 years ago

A cyclist travels 20 miles in the same amount of time it takes a hiker to walk 6 miles. The rate of the cyclist is 7 mph faster

Anna11 [10]

Answer:

The speed of the cyclist is 10 miles per hour .

Step-by-step explanation:

Given as :

The distance cover by cyclist = $D_1$ = 20 miles

The distance cover by biker = $D_2$ = 6 miles

The speed of biker = $S_2$ = s mph

The speed of cyclist = $S_1$ = 7 + s mph

The time taken by both cyclist and biker = t hour

Now. Distance = Speed × Time

So, $D_1$ = $S_1$ × t

Or, 20 = s × t

Or, t = $\frac{20}{7+s}$ .....1

And ,

$D_2$ = $S_2$ × t

or, 6 = s t

Or, t = $\frac{6}{s}$ ....2

From Eq 1 and 2

I.e $\frac{20}{7+s}$ = $\frac{6}{s}$

Or, 20 s = 6 ( 7 + s )

Or, 20 s - 6 s = 42

Or, 14 s = 42

∴ s = $\frac{42}{14}$

I,e s = 3 miles per hour

So, The speed of biker = $S_2$ = s = 3 miles per hour

And The speed of cyclist = $S_1$ = 7 + s = 7 + 3= 10 miles per hour

Hence The speed of the cyclist is 10 miles per hour . Answer

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.. solve it solve it

Volgvan

Answer:

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