20 degrees-> acute since less than 90
27 degrees-> acute since less than 90
133 degrees-> obtuse since more than 90
Multiply the triangles then divide to find the missing number
Corresponding altitudes are corresponding parts. They are congruent because ... Corresponding parts of congruent triangles are congruent. (CPCTC)
You would be subtracting by 5 so the next three would be -16, -21, -26
Remember property of exponents

add exponents of same base
ok so
50,000 is 5 times 10^4
so
50000 times 10^15=
5 times 10^4 times 10^15=
5 times

=
5 times 10^19