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koban [17]
3 years ago
7

A sand dune stands 5 feet above sea level. The hill is eroding at a rate of 1 foot per 20 years. Let y represent the height of t

he sand dune after x years. Which equation represents the situation?
Mathematics
1 answer:
Over [174]3 years ago
6 0
The given 5 feet above sea level could be taken as the y-intercept, while the rate of -1 foot per 20 years could be taken as the slope. The height y is a function of time. Using y-intercept slope form of a line: Y = (-1/20)t + 5
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Answer:

c) 1 2 4 8

Step-by-step explanation:

<u>Explanation </u>:-

<u><em>Geometric sequence</em></u>

The sequence is of the form a , a r , a r² , a r³ ,.......

'a' is the first term

'r' is the common ratio

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here a = 1

common ratio   r = \frac{a_{2} }{a_{1} } = \frac{2}{1} = 2

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\huge{\underline{\boxed{\tt{Answer:}}}}

Let AB be a chord of the given circle with centre and radius 13 cm.

Then, OA = 13 cm and ab = 10 cm

From O, draw OL⊥ AB

We know that the perpendicular from the centre of a circle to a chord bisects the chord.

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From the right △OLA, we have

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==> [(13)² – (5)²] cm² = 144cm²

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