3 years ago

Heidi is doing a study for her statistics class, and she needs to obtain a random sample of students from a local college

Mathematics

1 answer:

Masja [62]3 years ago

3 0

I known you cant argue with that

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What numbers add to 32 and multiply to -80??

VARVARA [1.3K]

X+y=32
xy=-80

x+y=32
minus x both sides
y=32-x
sub for y

x(32-x)=-80
32x-x^2=-80
times both sides by -1
x^2-32x=80
minus 80 both sides
x^2-32x-80=0
use quadratic formula
where
ax^2+bx+c=0
x= $\frac{-b+/- \sqrt{b^2-4ac} }{2a}$

a=1
b=-32
c=-80

x= $\frac{-(-32)+/- \sqrt{(-32)^2-4(1)(-80)} }{2(1)}$
x= $\frac{32+/- \sqrt{1024+320} }{2}$
x= $\frac{32+/- \sqrt{1344} }{2}$
x= $\frac{32+/- 8\sqrt{21} }{2}$
x=16+/-4√21

the numbers are
16+4√21 and 16-4√21

5 0

3 years ago

Please help, Select the graph of the equation below. y=3/2x^2-6x.

valentinak56 [21]

So before we can decide which graph it is, we have to find the zeros (x-intercepts) of this graph. We can do this by setting y to 0.

Firstly, factor out 3x on the right side of the equation: $0=3x(\frac{x}{2}-2)$

Next, use the zero product property to solve y = 0:

$3x=0\\ x=0$

$\frac{x}{2}-2=0\\\\ \frac{x}{2}=2 \\ \\ x=4$

So we know that the zeros of this equation are (4,0) and (0,0). Looking at the four graphs, the only graph that has a line crossing those 2 points is the first graph. Therefore, the graph of this equation is the first graph.

4 0

3 years ago

3 with the power of 5 equals 243 explain how to use that fat quickly evaluate 3 to the power of 6

Lady bird [3.3K]

Answer:

3 to the power of 6 is 729

Step-by-step explanation:

7 0

3 years ago

12 11 10 NA 9 3 8 4 7 5 6

Mariana [72]

4 I just took the quiz