Find the altitude of the triangle with a side of 18.
Put into sqrt.

Step-by-step explanation:

BD = DC = 1/2 BC ---> AD is median ( because in equilateral triangle altitude equals to median )

so, therefore

AB = 18 (given)

BD = 1/2 BC

BD = 1/2 × 18

BD = 9

AB² = AD² + BD² ---( by pythagoras theorm)

18² = AD² + 9²

324 = AD² + 81

324 - 81 = AD²

243 = AD²

then,

AD = √243

AD = 15 58

e) this means that it has a slope of 0 and that the y-intercept would be at 70. This means that the daily cost would stay at $70 no matter how far the distance is.

Equation: y = 70

(I'm sorry if this is wrong, but if it's not I hope it helps!)

Step-by-step explanation:

e) a horizontal line passing through the point of intersection (which is (100,70))  means that it has a slope of 0 and that the y-intercept would be at 70. This means that the daily cost would stay at $70 no matter how far the distance is.

Equation: y = 70

(this is how we would write it since there is a slope of 0)