Answer:
4%
Step-by-step explanation:
Check the picture below.
make sure your calculator is in Degree mode.
Recall that given the equation of the second degree (or quadratic)
ax ^ 2 + bx + c
Its solutions are:
x = (- b +/- root (b ^ 2-4ac)) / 2a
discriminating:
d = root (b ^ 2-4ac)
If d> 0, then the two roots are real (the radicand of the formula is positive).
If d = 0, then the root of the formula is 0 and, therefore, there is only one solution that is real and of multiplicity 2 (it is a double root).
If d <0, then the two roots are complex and, in addition, one is the conjugate of the other. That is, if one solution is x1 = a + bi, then the other solution is x2 = a-bi (we are assuming that a, b, c are real).
One solution:
A cut point with the x axis
Two solutions:
Two cutting points with the x axis.
Complex solutions:
Does not cut to the x axis
Same signs add and keep, different signs subtract and keep the sign of the higher number. If you subtract intergers you keep,change, change the signs .
Answer: Emma’s mean is 189. Devins mean is 186.
Step-by-step explanation:
Emma: 147+143+181+232+193+207+205+221+172= 1701. 1701 divided by nine: 189.
Devin: 185+186+194+197+198+155+194+163+202= 1674 divided by nine: 186.
Coach should choose Emma.
Hope i helped have an awesome Friday!
