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4 years ago

Twice a number is equal to negative four. Which equation could be used to find the number? 2n = 4 2n = -4n 2n - 4 2n = -4

Mathematics

2 answers:

Allisa [31]4 years ago

7 0

If n represent number so the correct answer is 2n=-4

Pepsi [2]4 years ago

4 0

Twice a number is equal to negative four :
2n = -4

answer
2n = -4
last one is your answer

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Y = x^2 - 4x + 4 Find the discriminant. Determine the number of real solutions.

weqwewe [10]

Answer:

The discriminant is 0

There is 1 real solution

Step-by-step explanation:

Use the discriminant formula, D = b² - 4ac

In the equation y = x² - 4x + 4, a is 1, b is -4, and c is 4.

Plug in these values into the formula:

D = b² - 4ac

D = (-4)² - 4(1)(4)

D = 16 - 4(4)

D = 16 - 16

D = 0

So, the discriminant is 0.

With a discriminant of zero, there is one real solution.

So, the number of real solutions is 1.

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3 years ago

: Logan is driving a boat that has a speed of 18 mph in standing water (no current). She drives the boat up and down a river to

nadya68 [22]

Answer: the speed of the current is 6 mph

Step-by-step explanation:

Let x represent the speed of the current.

Logan is driving a boat that has a speed of 18 mph in standing water.

Assuming the current slowed down the boat while she was going up(upstream), it means that his total speed was (18 - x) mph

Also, if the current helped the boat while she was going down(downstream), it means that his total speed was (18 + x) mph

Time = distance/speed

The boat travels 4 miles each way. The time taken to travel upstream is

4/(18 - x)

Time taken to travel downstream is

4/(18 + x)

The round trip took 0.5 hour. It means that

4/(18 - x) + 4/(18 + x) = 0.5

Multiplying through by (18 - x)(18 + x), it becomes

4/(18 - x) + 4/(18 + x) = 0.5(18 - x)(18 + x)

4(18 + x) + 4(18 - x) = 0.5(18 - x)(18 + x)

72 + 4x + 72 - 4x = 0.5(324 + 18x -

18x - x²)

144 = 0.5(324 - x²)

144 = 162 - 0.5x²

0.5x² = 162 - 144

0.5x² = 18

x² = 18/0.5 = 36

x = √36

x = 6

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3 years ago

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A.......................... is the answering to this

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kiruha [24]

The answer is x is less than or equal to 6
Hope this helped :)

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3 years ago

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What is the midpoint of a line segment with the endpoints (-6,-3) and (9,-7)?

Amanda [17]

Answer:

Step-by-step explanation:

To get a midpoint, you add both endpoint x coordinates and divide by 2. Then add both y coordinates and divide by 2. The result is (1.5,-5)

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