Y = 5/7 x - 12 / * 7 ( we will multiply both sides of the equation by 7 )
7 y = 5 x - 84
7 y - 5 x = 5 x - 5 x - 84
7 y - 5 x = - 84
- 5 x + 7 y = - 84
Answer: The equation in standard form is C ) - 5 x + 7 y = - 84
Answer:

Step-by-step explanation:
Given
See attachment for table
Required
Determine the explicit formula for the table
First, we need to check if the guppies increases at arithmetic progression or geometry progression.
For arithmetic progression:
We calculate the common difference (d)

Take n as 1


From the table:



Take n as 2

From the table:



The two differences are not equal. So, this
For geometry progression:
We calculate the common ratio (r)

Take n as 1


From the table:



Take n as 2

From the table:



The two ratios are equal.
So, the next step is to calculate the explicit formula using n term of a geometric progression.
Because the progression starts from 0, we make use of the following formula

Substitute values for g(0) and r

Hence:
The explicit formula is: 
Answer:
7
Step-by-step explanation:
The answer of 8(x+12)=15x+47 is 7
if you need explanation just ask
I did not understand the second question, Y=12??
Answer:
10 cm.
Step-by-step explanation:
In order to better understand this question, I will attach an allusive image to the question.
Keep in mind that in this case the base of the triangle is equal to the radius of the base of the cone since the triangle rotates on its own axis, therefore the measurement of the base corresponds to 10 cm, therefore the radius measures 10 cm.