Answer:
135
Step-by-step explanation:
First, divide.
18 ÷ 4 = 4.5
Then, multiply.
4.5 × 30 = 135
Have a great day!
Answer:
Two
Step-by-step explanation:
And these are Elimination and substitution
This type of equation is Simultaneous equation
Answer:
58593
Step-by-step explanation:
The sum to n terms of a geometric sequence is
= 
where a is the first term and r the common ratio
r = 15 ÷ 3 = 75 ÷ 15 = 5 and a = 3, hence
= 
=
=
= 58593
Yes because 3*4x is 12x and 3*8 is 24 so you would get 12x+24
Its should be a negative correlation hope its the right anwser