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3 years ago

Which numbers are divisible by 9

Mathematics

2 answers:

tankabanditka [31]3 years ago

7 0

<span>A number is divisible by 9, if the sum is a multiple of 9 or if the sum of its digits is divisible by 9.

</span>

GalinKa [24]3 years ago

5 0

Any real number is divisible by 9. If you want integers divisible by 9, perfectly, then they have to follow this simple rule:
$9n \geq 9$

where:
$n \ \textgreater \ 1$

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taurus [48]

Answer:

a=17√2

Step-by-step explanation:

Hi there!

We are given a right triangle with the measure of one angle being 45°, and one of the sides being measured 17

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first, let's find the measure of the other angle

because it's a right triangle, the sum of the acute angles are complementary, meaning they add up to 90°

let's make the unknown degree of the other angle x

so that means to find x:

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You may notice since we have two angles with the same measure, that means this triangle is isosceles.

That means the other leg (the other side that isn't marked) is also 17

of course, you could solve for a using Pythagorean theorem, but there's actually a shortcut:

in 45°-45°-90°Δ, the legs are a specific value, and the hypotenuse (the side opposite from the 90° is the value of the legs*√2 (for example, if the legs are 3, then the hypotenuse is 3√2). To remember the rule, if the legs have a measure of s, the hypotenuse has a measure of s√2

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