Answer:
≥ 420 boards
Step-by-step explanation:
Write the required relation between cost per board and "x" (the number of boards that must be sold).
143 + 30240/x ≤ 215 . . . . . . . note that the first term is <em>not</em> 143x
Subtract 143
30240/x ≤ 72
Multiply by x/72. This is a positive number because x is a positive number.
30240/72 ≤ x
420 ≤ x
At least 420 surfboards must be sold to limit the final cost per board to $215.
A scale factor of 3 was used
0,0
1,2
2,4
3,6
4,8
There u go hope u get it done
Do not expand the brackets, divide both sides by -2 and reverse the inequality!
So x + 6 < -41/-2 = 20.5
Now subtract 6 from both sides
x < 14.5
Graph by drawing a circle at 14.5 and an arrow from the circle pointing left.
The solution set is all real numbers up to, but not including, 14.5
