saseflower

Infinity is a number greater than any assignable quantity or countable number

The angle of depression is congruent to the angle of elevation (this assumes the object is close enough to the observer so that the horizontals for the observer and the object are effectively parallel; this would not be the case for an astronaut in orbit around the earth observing an object on the ground)

14 ÷ 416 = 0.03365384615

7 2/3 + 8 5/6 =

First, find the common denominator, which is 6

7 4/6 + 8 5/6 =

Now add those 2 numbers together

15 9/6 (I show it as an inproper fraction so you can see how it turns into the answer below)

Simplify

16 3/6

Simplify again

16 1/2

And there's your answer!

If a number is too big or too small to fit in a calculater display, often scientific notation using the letter E (or e) for exponent (power or index) will be used

-4 (x - 3) > -4

Use distributive property

-4x - (-12) > -4

Simplify (you can skip this step and instead put the equation that is below, up ^ if that makes sense)

-4x + 12 > -4

Subtract 12 from both sides

-4x > -16

Divide by -4 on both sides

x > 4

And there's your answer :)

Subtract in 2?

If you mean subtract 2 :

20 - 2

18

If you mean divide by 2 (which you're probably not but just to make sure) :

20 ÷ 2

10

2x - 3 ( 4x + 7 )

Use distributive property

2x - 12x + 21

Combine like terms

-10x + 21

And that is as far as you can go, since there is no equal sign and no number or variable on the other side of the equal sign :)

-7 - (-14)

2 negatives equal a positive

-7 + 14

Add those together

7

And there's your answer!

P.S If you're confused about why 2 negatives equal a positive, think of it this way. If you are subtracting -14, what are you actually doing? You are adding 14.