In order to simplify an expression you have to have the same variables, to the same power.
1a) There are no more H's or numbers without a variable.
1b) The variables do not match.
1c) The variable is to a different power so it can't be simplified.
So to simplify you combine your "like terms"
2a,b, and c are correct :)
2d) already simplified
2e) since the variables are the same, just focus on the numbers (x=h since it won't let me use it) answer: 6x

2g) For this one 9 has no variable and no like terms, so it stays by itself, just focus on the a's (x=a) answer: 9+4x

2j) answer: 11y^2+5y
Answer:
See explanation
Step-by-step explanation:
Given
The attached triangle
Required
Complete the ratios
(a) sin B
is calculated as:


(b) cos B
is calculated as:


(c) tan B
is calculated as:


(d) tan A
is calculated as:


(e) cos A
is calculated as:


(f) sin A
is calculated as:


Answer
8
Step-by-step explanation:
5+12=17 and 17-9=8
Answer:
27 of the pets are dogs.
Step-by-step explanation:
Real easy way to do this, treat 45 (the total) as 100. So, do 45/100 then multiply the result of that by 60, and you end up with 27.
45/100=0.45
0.45*60=27