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pochemuha
3 years ago
14

Evaluate: a). 25 −12 [5+4 − (3 + 2−1+3)] b). 36 − [18− (14− (15−4÷2×2))]

Mathematics
2 answers:
qwelly [4]3 years ago
8 0

Answer:

A=1

B=21

:)

Step-by-step explanation:

coldgirl [10]3 years ago
5 0
Hiya
a=1
b=21
hope it helps
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If 1/2 paint cover 1/8 of the wall,then how many quarts cover the whole wall
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Step-by-step explanation:

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3 years ago
A plane flying horizontally at an altitude of 2 mi and a speed of 540 mi/h passes directly over a radar station. Find the rate a
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Answer:

The plane's distance from the radar station will increase about 8 miles per minute when it is 5 miles away from it.

Step-by-step explanation:

When the plane passes over the radar station, the current distance is the altitude h = 2. Then it moves b horizontally so that the distance to the station is 5. We can form a rectangle triangle using b, h and the hypotenuse 5. Therefore, b should satisfy

h²+b² = 5², since h = 2, h² = 4, as a result

b² = 25-4 = 21, thus

b = √21.

Since it moved √21 mi, then the time passed is √21/540 = 0.008466 hours, which is 0.51 minutes. Note that in 1 minute, the plane makes 540/60 = 9 miles.

The distance between the plane and the radar station after x minutes from the moment that the plane passes over it is given by the function

f(x) = \sqrt{((9x)^2 + 2^2)} = \sqrt{(81x^2+4)}

We have to compute the derivate of f in x = 0.51. The derivate of f is given by

f'(x) = \frac{162x}{2\sqrt{81x^2+4}}

also,

f'(0.51) = \frac{162*0.51}{2\sqrt{81*0.51^2+4}} = 8.2486

The plane's distance from the station will increase about 8 miles per minute.

4 0
3 years ago
Find f(2) if f(x) = 2x + 1
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Answer: f(2)=5

Step-by-step explanation:

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f(2)=5

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Step-by-step explanation:

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Step-by-step explanation:

4 0
2 years ago
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