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Ivan
3 years ago
9

What expression is equivalent to 4(2x+7)

Mathematics
1 answer:
Serga [27]3 years ago
5 0

Not sure if you have an answer choice but with my guess distribute the sums and it should leave an expression of 8X+28

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A store employes 11 women and 12 men. What percentage of employes are men?
Oksanka [162]

2.53 is then answer .... im pretty sure

7 0
2 years ago
A plane flying horizontally at an altitude of 1 mile and a speed of 570 mi/h passes directly over a radar station. Find the rate
valina [46]

The rate at which the distance from the plane to the station increases is 537 miles/hour. Computed using Pythagoras Theorem and Differentiation.

We assume the station to be at point A.

The plane when directly over the station, takes point C.

As it is flying horizontally continuously at an altitude of 1 mile, AC = b = 1 mile.

The plane flies continuously, and when it is at a distance of 3 miles from the station, it is at point B.

The distance between the plane and the station of 3 miles can be shown as AB = c = 3 miles.

The movement of the plane from C to B can be shown as BC = a.

Now, from the given case, we get a right triangle ABC.

By Pythagoras' Theorem,

a² + b² = c² ... (i).

or, a² + 1² = 3²,

or, a² = 9 - 1 = 8,

or, a = 2√2 miles.

We are told that the plane is moving at a speed of 570 miles/hour.

This can be shown as, da/dt = 570 miles/hour.

As the plane is moving horizontally, the vertical distance between the plane and the station doesn't change, that is, db/dt = 0.

In the question, we are asked to find the rate at which the distance from the plane to the station is increasing, that is, we are asked to find dc/dt.

Differentiating (i), with respect to time t, we get:

2a(da/dt) + 2b(db/dt) = 2c(dc/dt).

Substituting values of a = 2√2 miles, b = 1 mile, c = 3 miles, da/dt = 570 miles/hour, and db/dt = 0, we get:

2(2√2)(570) + 2(1)(0) = 2(3)(dc/dt),

or, 2280√2 + 0 = 6(dc/dt),

or, dc/dt = 380√2 miles/hour = 537.40 miles/hour ≈ 537 miles/hour.

Thus, the rate at which the distance from the plane to the station increases is 537 miles/hour. Computed using Pythagoras Theorem and Differentiation.

Learn more about the Pythagoras Theorem and Differentiation at

brainly.com/question/15291822

#SPJ4

4 0
2 years ago
Find the ratio of the geometric sequence 11,99,891
nadya68 [22]

Answer:

Ratio is 9

Step-by-step explanation:

Common ratio can be obtained by dividing second term by first term, third term by second term etc

Therefore

99/11 = 9

891/99 = 9

The common ratio is 9

8 0
3 years ago
I WILL GIVE CROWN JUST NEED HELP ASAP
Sedaia [141]

Answer:

C. All trapezoids have exactly one set of parallel sides.

7 0
3 years ago
Read 2 more answers
System of equations y >4, and y> |x-1|
Paul [167]
Y>(+)x+1
Y>4

Y>(+)x
Y>3

X=3
6 0
2 years ago
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