Add or subtract. –4 + (-16)

Step-by-step explanation:

Step 1:  Combine

Adding a negative number is same as subtracting a positive number.

Subtract.

Step-by-step explanation:

The negative from the -16 takes over, so you would have to subtract.

So,

-4-16=-20

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step-by-step explanation:

d = distance between moon and sun, which in this problem is the hypotenuse of a right triangle.  

the distance y is the side opposite to angle x in the right triangle.   use the definition of the sine function from basic trigonometry.

sin(x) = y/d ⇒

d = y/sin(x)

logv3(x+2)=1

rewrite in exponential form:

logb(x) = y is equal to b^y =x

b = 3, y = 1

now solve for x:

3^1 = x+2)

x = 3-2

x = 1

see the picture for the graph.