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3 years ago

The difference of 4 times a number and 7 is 13

Mathematics

1 answer:

vekshin13 years ago

4 0

I believe the answer is either 5 or -1.5

4n - 7 = 13
7 - 4n = 13

4(5) - 7 = 13
7 - 4(-1.5) = 13

4(5) - 7 = 13

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2x + 5y - 28<br> -2x - 5y = -18<br><br> Elimination

lidiya [134]

Answer:

no solution I believe

Step-by-step explanation:

b/c x and y cancel out so it cant be solved

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3 years ago

From a height of 50 meters above sea level on a cliff, two ships are sighted due west. The angles of depression are 61° and 28°.

Olenka [21]

Answer:

The ships are 66 meters apart.

Step-by-step explanation:

For the sake of convenience, let us label ships A and B

As shown in the figure, the distances to the ships from right triangles.

The distance to the ship A is $d_1$ and it is given by

$tan (61^o)= \dfrac{50}{d_1}$

$d_1=\dfrac{50}{tan (61^o)}$

$\boxed{d_1= 27.71m}$

And the distance to the ship B is $d_2$ and is given by

$tan (28^o)= \dfrac{50}{d_2}$

$d_2=\dfrac{50}{tan (28^o)}$

$\boxed{ d_2=94.04m}$

Therefore, the distance $d$ between the ships A and B is

$d= d_2-d_1=94.04-27.7\\\\\boxed{d=66m}$

In other words, the ships are 66 meters apart.

8 0

3 years ago

Read 2 more answers

Connor is constructing square ABCD. He has plotted A at (−2, 4), C at (−1, 1) and D at (−3, 2). Which coordinate could be the lo

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Answer: The answer is B(0,3)

Step-by-step explanation: I took the test and made sure it was correct

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3 years ago

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seagull is flying at 125 feet above sea level. A dolphin is swimming 23 feet below sea level. What is the distance in feet betwe

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Answer:

102 feet.

Step-by-step explanation:

-23ft + 125ft = 102 ft

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3 years ago

While working out, Susie does 25 sit-ups for every 12 push-ups. If she does 60 push-ups, how many sit-ups will she do?

Sholpan [36]

Answer:

125 situps

Step-by-step explanation:

We can use a ratio to solve

25 situp x situps

--------------- = --------------

12 pushup 60 pushups

Using cross products

25 * 60 = 12x

Divide each side by 12

25*60/12 = 12x/12

125 = x

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3 years ago