PLEASE ANSWER WILL MARK BRAINIEST IF CORRECT :)
1. What is the set of solutions for the following problems: Find all even integers divisible by 5.

The set of elements is { where where n∈ }

2. Find the following sets if ℤ is the universal set:

9. (y^-5)^10y^10 a. y^-60 b. y^60 c. y^-150 d. y^150 find the simplified form of each expression. 10. (4/7^5)^2 a.8/14^10 b.16/49^25 c.16/49y^10 d.8/14y^25 11. determine if the number 3.43 times 10^-6 is written in scientific notation. if not, explain. a. yes; the number is written scientific notation. b. no; the first factor is not a number between 1 and 10. c. no; it is not written as a number times a power of 10

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.