Ill give brainliest to first answer

$120 for 20 lessons

Step-by-step explanation:

Divide each to find the cost for each lesson:

First choice: 90/10 = 9 or $9 per lesson

Second choice: 160/20 = 8 or $8 per lesson

Third choice: 80/10 = 8 or $8 per lesson

Fourth choice: 120/20 = 6 or $6 per lesson.

$120 for 20 lessons is your answer for it is cheaper by $2 (in comparison to choice 2 & 3), and by $3 (in comparison to first choice).

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1