a = 4, b = -21, c = -18
to keep from getting "mixed up", evaluate the discriminant first ...
b<sup>2</sup> - 4ac = (-21)<sup>2</sup> - 4(4)(-18) = 729
sqrt(729) = 27
x = (21 +/- 27)/8
x = -3/4, x = 6
since the discriminant is a perfect square, the original quadratic will factor ...
4x<sup>2</sup> - 21x - 18 = 0
(4x + 3)(x - 6) = 0
x = -3/4, x = 6
W=A\L
Divide L from both sides
The L in the right cancels out
Step-by-step explanation: do fast
when you will upload the picture do fast
Answer:
x ≈ 61.3
Step-by-step explanation:
Using the Sine rule, that is
= 
( cross- multiply )
5.8 × sinx = 6 × sin58° ( divide both sides by 5.8 )
sin x = 
≈ 0.87729, thus
x = 
(0.87729) ≈ 61.3
Answer:
22*1.06 = cost of meal with tax = 23.32
22*.20 = tip on the pre-tax cost = 4.40
Total = $27.72
Step-by-step explanation:
