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3 years ago

Find the sum. (7y+7)+(3m−3)+(8x+8) Thanks

Mathematics

1 answer:

saul85 [17]3 years ago

8 0

Answer:

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Step-by-step explanation:

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Nana76 [90]

What is the question asking ???

7 0

3 years ago

Read 2 more answers

3. A person standing 3 feet away from the base of a lamp post casts a shadow 4 feet long. If the person is 6 feet tall and walks

german

Answer:

533.33 ft/min

Step-by-step explanation:

We are given that

x=3 feet

y=4 feet

Height of person,h=6 feet

$\frac{dx}{dt}=400 ft/min$

Triangle ABC and A'B'C are similar because all right triangles are similar

By using similarity property

$\frac{h'}{6}=\frac{7}{4}$

$h'=10.5 feet$

$x+y=3+4=7 feet$

$\frac{h'}{6}=\frac{x+y}{y}$

$\frac{10.5}{6}=\frac{x+y}{y}$

$10.5y=6x+6y$

$10.5y-6y=6x$

$4.5y=6x$

Differentiate w.r.t t

$4.5\frac{dy}{dt}=6\frac{dx}{dt}$

$\frac{dy}{dt}=\frac{6\times 400}{4.5}ft/min$

$\frac{dy}{dt}=533.33ft/min$

Hence, If the person is 6 feet tall and walks away from the lamp post at a speed of 400 feet per minute then his shadow moving at the rate 533.33 ft/min

7 0

3 years ago

Write a multiplication sentence that shows the zero property of multiplication. Explain why it shows this property.

Aloiza [94]

Okay so the zero property of multiplication is anything times zero equals zero, so just use a number, multiply it times zero, and show what it equals (which is zero) explain that it shows the property because the variable is multiplied times zero.

4 0

4 years ago

What is the measurement of ∠N?

djverab [1.8K]

Answer:

The measure of angle N is 141°.

Step-by-step explanation:

From the given figure it is noticed that the angle 39° and angle N lies on a straight line. It means both angles are supplementary angles.

If two angles are known as supplementary angles, then their sum is 180°.

Since angle 39° and angle N are supplementary angle, therefore their sum is 180°.

$\angle N+39^{\circ}=180^{\circ}$