Answer:
1.)
y = 2x + 5 for x = 1
y = 2(1) + 5
y = 2 + 5
y = 7
2.) The function rule that relates the total cost of the party to the number of children n.
TCP = $60 + $4(n)
Not sure if I quite understand your question. But ill assume that you're asking if 1 times 7 is positive. Or if 1x7 is positive.
1 times 7 equals 7 so it is a positive integer.
1x7 can be positive or negative depending on what x equals. If x is a negative number then the whole expression is negative. If x is postive the expression is positive.
E

e=mfg
Where m is a constant of proportionality;
e=4, f=2 and g=8
Then;
4=m*2*8
4=16m
m=0.25
A)

is
false. There is no solution.
B)

is true. There are infinite solutions.
C)

is true. There are infinite solutions.
D)

is true. There are infinite solutions.