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3 years ago

What substance in the upper atmosphere blocks ultraviolet radiation from the sun, making life on land possible?

2 answers:

6 0

It is the ozone layer. if we didnt have that we would be exposed to solar radiation but if there is to much caused by greenhouse gases it will bacome to thick leading to a ice age as the sun can no longer pass through.

algol [13]3 years ago

6 0

Answer: (B) Ozone

Explanation:

Ozone is the type of substance which is present in upper atmosphere. The ozone layer is the basically blocks the ultraviolet radiation which is comes from the sun and it is the combination of single molecule with the 3 oxygen atoms.

The ozone layer absorb the ultraviolet radiation and also prevent from the harmful radiation. It helps in make the life possible on the surface of earth. On the other hand, all the options are incorrect as they do not prevent from the UV radiation.

Therefore, Option (B) is correct.

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What river forms the border between Senegal and Mauritania

kondor19780726 [428]

B - Senegal River. Borders Senegal and Mauritania

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3 years ago

On a coordinate plane, 2 exponential functions are shown. f (x) = 5 Superscript x Baseline approaches y = 0 in quadrant 2 and in

kiruha [24]

Answer:

$k = -7$

Explanation:

Given

$f(x) = 5^x$ through (0,1) and (1,5)

$g(x) = 5^x + k$ through (0,-6) and (1,-2)

Required

Determine the value of k if f(x) is translated vertically down

To get the value of k, we perform the following operations.

For (0,-6) --- Substitute 0 for x and -6 for g(x) in $g(x) = 5^x + k$

$g(x) = 5^x + k$

$-6 = 5^0 + k$

$-6 = 1 + k$

$k + 1 = -6$

$k = -6 - 1$

$k = -7$

For (1,-2) --- Substitute 1 for x and -2 for g(x) in $g(x) = 5^x + k$

$g(x) = 5^x + k$

$-2 = 5^1 + k$

$-2 = 5 + k$

$k+5 = -2$

$k= -2-5$

$k = -7$

To further show that k = -7, we have the following:

$f(x) = 5^x$

When translated downward by 7 units, the function becomes

$g(x) = f(x) - 7$

Recall that: $g(x) = 5^x + k$ and $f(x) = 5^x$

So, we have:

$5^x + k = 5^x - 7$

Subtract $5^x$ from both sides

$5^x - 5^x + k = 5^x - 5^x + 7$

$k = -7$

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