Please help me

What does X equal please?

Angle AGF and FGD are complimentary angles meaning they add up to 90 degrees.  Since AGF is 77 and the total angle AGD is 90, we can solve for angle FGD.  90-77=FGD.  Angle FGD is 13 degrees.  Now angle EGC or simply angle x, is vertical angles with angle FGD.  So that means they are the same angle measure.  Since FGD is 13, x is also 13  

Step-by-step explanation:

it is b)

hope this : )

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for