Answer:
a) Linear
b) Linear
c) Linear
d) Neither
See explanation below.
Step-by-step explanation:
a) 
For this case the differential equation have the following general form:

Where
and
and since n>1 we can see that is a linear differential equation.
b) 
We can rewrite the following equation on this way:

For this case the differential equation have the following general form:

Where
and
and since n=0 we can see that is a linear differential equation.
c) 
For this case we can write the differential equation on this way:

For this case the differential equation have the following general form:

Where
and
and since n=0 we can see that is a linear differential equation.
d) 
For this case we can't express the differential equation in terms:

So the is not linear, and since we can separate the variables in order to integrate is not separable. So then the answer for this one is neither.
The algebraic expression is x = 2y where, "x" is the number of goals with Kumar and "y" is the number of goals with Jacob
<em><u>Solution:</u></em>
Given that Kumar has twice the number of goals as Jacob
To find: algebraic expression
An algebraic expression is a mathematical expression that consists of variables, numbers and operations
<em><u>Let us first define the variables</u></em>
Let "x" be the number of goals with Kumar
Let "y" be the number of goals with Jacob
Then from given statement,
Number of goals with kumar = twice the number of goals as Jacob
Number of goals with kumar = 2(number of goals with Jacob)
x = 2y
Thus the algebraic expression is found
Question
1-9n=-80
Answer
1-9n=80
-9n=-80-1
-9n=-81
n=9
Answer n=9
Factor
fg-5g+4f-20
g(f-5)+4(f-5)
now we factor out the (f-5) in both terms
(f-5)(g+4) is the factored out form