Answer:
the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
Step-by-step explanation:
Answer:
the second option
Step-by-step explanation:
in ax²+bx+c = 0:

subtract both sides by 6 to get to this form, as the right side will be left with 0
6x² + 8x - 6 = 0
here, the coefficient for x² (a) is 6, the coefficient for x (b) is 8, and the remaining number added on (c) is -6
plugging our numbers into the formula, we get

The answer is actually 1.571
30$ originally - 21$ paid = 9$ discount
> divide the discount by the original price, multiply by 100 to get the percent decrease.
100 x (9$ / 30$) = 30% discount
> So the shoes where on sale for 30% off the original price.
for the equation:
100 x (30-21)/30 = % decrease