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4 years ago

Rewrite the following without an exponent.

Mathematics

1 answer:

Mekhanik [1.2K]4 years ago

4 0

Answer:

(9/8)^-1 = 8/9

Step-by-step explanation:

To re write without an exponent means we will eliminate it's power.

This fraction came with the power of -1.

And when the power of a fraction or a whole number comes with power of -1 what it simply means it's the inverse of the number.

So let's evaluate the above fraction.

(9/8)^-1 = 1/(9/8)

(9/8)^-1 = 1*(8/9)

(9/8)^-1 = 8/9

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Select the best possible first step to solving the system by first eliminating the x variable.

ipn [44]

The best possible first step would be to multiply equation one by 4 and equation by 5 that would eliminate the y and allow you to solve for x.

In essence, 4 × (3x + 5y = 1) eq1
5 × (2x + 4y = -4) eq2

thus giving rise to 12x + 20y = 4 eq1 × 4
10x +20y = -20 eq2 × 5

You can then just subtract one equation from the other
For example, (12x + 20y = 4) - ( 10x +20y = -20 )

12x - 10x + 20y - 20y = 4 - (-20)
2x = 24
x = 12

8 0

3 years ago

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HELP MEHHHHHHHH

yKpoI14uk [10]

Answer:

The correct option is;

B. 50 km/h

Step-by-step explanation:

The information given in the question are;

The distance between the two cities = 140 km

The direction of motion of the first car = From A to B (left)

The direction of motion of the second car = From B to A

The time after which both cars meet = 1 hour

The time duration it takes after both cars meet for the second car to reach A = 35 minutes

The total time taken by the second car from city B to city A = The time it takes to meet the first car + The time it takes after meeting the first car to reach city A

∴ The total time taken by the second car from city B to city A = 1 hour + 35 minutes = 60 minutes + 35 minutes = 95 minutes

95 minutes = 95/60 hours = 1⁷/₁₂ hours = 1.58 $\bar 3$ hours

The speed of the second car = Distance/Time = 140 km/(1.58 $\bar 3$ hours) ≈ 88.42 km/h

Therefore, let the distance from A of the point the first car meet the second car = x

Therefore, we have;

The distance from B of the point both cars meet = (140 - x) km

Given that both cars meet after one hour, we have;

The distance travelled by the second car coming from city B, after one hour = (140 - x) km = Speed of the second car × 1 hour

88.42 km/h × 1 hour = 88.42 km = (140 - x) km

x = 140 - 88.42 ≈ 51.58 km

The distance from A of the point the first car meet the second car = x = 51.58 km

The speed of car A = (The distance from A of the point the first car meet the second car)/(Time it takes both cars to meet)

∴ The speed of the first car = 51.58 km/(1 hour)

The speed of the first car = 51.58 km/h ≈ 50 km/h (Rounding up to the nearest 10th).

5 0

3 years ago

WHOEVER GETS IT RIGHT GETS BRAINLIEST

Kobotan [32]

Hi there! The answer is B.

$(75x - 49y) - (62x + 18y) =$

First work out the parenthesis.
$75x - 49y - 62x - 18y =$

Next collect the terms.
$13x - 67y$

The answer is B.

5 0

3 years ago

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Solve the system by substitution 4x+4y= 12 and x+2y=11

Reika [66]

Answer:

x = -5 and y = 8

Step-by-step explanation:

To solve the system by substitution, solve one equation for a variable. Then substitute the equation into the other equation.

x + 2y = 11 becomes x = 11 - 2y

Substitute x = 11 -2y into 4x + 4y = 12.

4(11-2y) + 4y = 12

44 - 8y + 4y = 12

44 - 4y = 12

32 = 4y

y = 8

Substitute again with y = 8 into the equation to find x.

x = 11 - 2(8)

x = 11 - 16

x = -5

4 0

3 years ago

What is y*18 +48 please help me

Savatey [412]

893 hope that helps tank u

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3 years ago

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