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natita [175]
3 years ago
13

Answer this and I’ll make you Brainly!!

Mathematics
2 answers:
ANEK [815]3 years ago
6 0

Answer:

-20

Step-by-step explanation:

2(xy-7)

When x=-1 y=3

Substitute the value of x and y in the equation given

Dealing with the bracket first

xy=-1×3

xy=-3

Substitute it into the bracket (-3-7)

=-10

Then back to the question

2(-10)

= -20

morpeh [17]3 years ago
3 0
X=-1
y=3

2(xy-7) = ?

Substitute the numbers
2(-1x3-7)

Use BIDMAS
2(-3-7)
2(-10)
-20
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A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 4 ft/s along
mina [271]

Answer:

The tip of the man shadow moves at the rate of \frac{20}{3} ft.sec

Step-by-step explanation:

Let's draw a figure that describes the given situation.

Let "x" be the distance between the man and the pole and "y" be distance between the pole and man's shadows tip point.

Here it forms two similar triangles.

Let's find the distance "y" using proportion.

From the figure, we can form a proportion.

\frac{y - x}{y} = \frac{6}{15}

Cross multiplying, we get

15(y -x) = 6y

15y - 15x = 6y

15y - 6y = 15x

9y = 15x

y = \frac{15x}{9\\} y = \frac{5x}{3}

We need to find rate of change of the shadow. So we need to differentiate y with respect to the time (t).

\frac{dy}{t} = \frac{5}{3} \frac{dx}{dt} ----(1)

We are given \frac{dx}{dt} = 4 ft/sec. Plug in the equation (1), we get

\frac{dy}{dt} = \frac{5}{3} *4 ft/sect\\= \frac{20}{3} ft/sec

Here the distance between the man and the pole 45 ft does not need because we asked to find the how fast the shadow of the man moves.

7 0
3 years ago
Which statements are true about the figure? Select two
Nat2105 [25]

Answer:

The correct answers are A, C, D!

Step-by-step explanation:

I hope you do great!!

4 0
3 years ago
Simplify 616/196<br> thirteen points for whoever answers the best please help!
mixas84 [53]
That’s the equation for pi, but the simplified fraction is 22/3 (please mark brainliest)
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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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