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Sever21 [200]
3 years ago
15

Pls help i really really need it, the question is on the picture

Mathematics
1 answer:
Virty [35]3 years ago
5 0

Step-by-step explanation:

Use ToA method (tan = opposite / adjacent)

For this question we have to use pythagoras' Theorem to find the adjacent side.

take a as the length of the adjacent side.

given b = 12

c = 13

By pythagoras' Theorem,

{c}^{2}  =  {a}^{2}  +  {b}^{2}  \\  {a}^{2}  =  {c}^{2}  -  {b}^{2}  \\  {a}^{2} =  {13}^{2}   -  {12}^{2}  \\  {a}^{2}  = 169 - 144 \\  {a}^{2}  = 25 \\ a =  \sqrt{25}  \\  = 5

Now we can find tan(x)

tan(x) = Opposite / adjacent

=  \frac{12}{5}

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I put $500 in the bank. I now have $5000in the bank. Every year my money increased by 5%. How long that it takes?
Mashutka [201]

Answer:

It takes 47.19 years

Step-by-step explanation:

Your amount on the bank is given by the following equation:

P(t) = P(0)(1+r)^{t}

In which P(t) is your current amount, P(0) is the initial amount, r is the rate it changes, and t is the time since the money has been put on the bank.

I put $500 in the bank.

This means that P(0) = 500

I now have $5000 in the bank.

This means that P(t) = 5000

Every year my money increased by 5%

This means that r = 0.05

How long that it takes?

This is t.

P(t) = P(0)(1+r)^{t}

5000 = 500(1.05)^{t}

(1.05)^{t} = \frac{5000}{500}

(1.05)^{t} = 10

\log{(1.05)^{t}} = \log{10}

We use the following logarithms property:

\log{a^{t}} = t\log{a}

So

t\log{1.05} = \log{10}

t = \frac{\log{10}}{\log{1.05}}

t = 47.19

It takes 47.19 years

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If the height of a mountain erodes away by a total of
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