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Bess [88]
3 years ago
5

Janelle subtracts -4 from a number. The results is 2. What is the number?

Mathematics
2 answers:
Nadya [2.5K]3 years ago
5 0

Answer:

ANSWER: The number is - 2

Step-by-step explanation:

(-4) = 2x + 4 = 2x = 2 - 4x = -2

Travka [436]3 years ago
5 0

Answer:

  • -2

Step-by-step explanation:

<u>Let the number is x, then we have:</u>

  • x - (-4) = 2
  • x = 2 + (-4)
  • x = 2 - 4
  • x = -2
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Suppose it takes 45 hours for robot A to construct a new robot. Working together with robot B, it takes 25 hours for both robots
Len [333]

Answer:

56 hours 25 minutes

Step-by-step explanation:

Given:

Suppose it takes 45 hours for robot A to construct a new robot

It takes 25 hours for both robots to construct a new robot.

Question asked:

How long would it take robot B to construct a new robot, working alone ?

Solution:

Let the time taken by robot B to construct new robot = x

<u>By robot A</u>

It takes 45 hours to construct = 1 new robot

It takes 1 hour to construct = \frac{1}{45} \ new\ robot

<u>By robot B</u>

It takes x hours to construct = 1 new robot

It takes 1 hour to construct = \frac{1}{x} new robot

<u>By working together</u>

It takes 25 hours to construct = 1 new robot

It takes 1 hour to construct = \frac{1}{25} \ new\ robot

\frac{1}{25} new robot is constructed in = 1 hour

<u><em>New robot is constructed by both working together in 1 hour = New robot is constructed by robot A in 1 hour + New robot is constructed by robot B in 1 hour </em></u>

\frac{1}{25} =\frac{1}{45} +\frac{1}{x} \\

Subtracting both sides by \frac{1}{45}

\frac{1}{25}-\frac{1}{45} =\frac{1}{45} -\frac{1}{45}+\frac{1}{x} \\\\\frac{1}{25}-\frac{1}{45} =\frac{1}{x}\\\\ Taking\ LCM \ of \ 25\ and\ 45,\ we\ got\ 225

\frac{9-5}{225} =\frac{1}{x} \\ \\ \frac{4}{225} =\frac{1}{x}\\\\ By\ cross \ multiplication\\4\times x=225\\Dividing\ both\ sides\ by\ 4\\x=56.25\ hours

Thus, robot B would take 56 hours 25 minutes to construct a new robot, working alone.

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3 years ago
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atroni [7]

Answer:

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Step-by-step explanation:

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The length of a rectangular garden is 3 yards greater than the width of the garden. If the garden measures 15 yards diagonally,
aliina [53]

15 x 3= 45 so therefore 45 is the length hope that help!

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Heather's employer pays 80% of her health insurance premium. If the annual premium is $2447.25 and she is paid weekly, how much
FrozenT [24]

Answer:

37.65

Step-by-step explanation:

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