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2 years ago

The following stem-and-leaf plot represents the scores earned by Mr. Wood's class on their most recent science test.

Mathematics

2 answers:

Marizza181 [45]2 years ago

8 0

Answer:

Step-by-step explanation:

10 is my gess

rewona [7]2 years ago

5 0

Answer:

i think 10?

Step-by-step explanation:

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Where are the points for Y=-x^2+160x-5000

BaLLatris [955]

None are given. You have to invent your own points that satisfy the given equation.

Examples: If x = 0, y = -5000 => (0,-5000)
If x = 2, y = -(2)^2 + 160(2) - 5000 = 4 + 320 - 5000 => (2, -4676)

and so on. Find as many such points as you want, using the same approach.

4 0

3 years ago

Beth sold Half of her comic books and then bought nine more. She now has 28. With how many did she begin with? ( I need the step

DaniilM [7]

Does anyone know

because I don't

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3 years ago

Find the discriminant, and determine the number of real solutions. then solve x^2 +8x+20=0

vodomira [7]

Answer:

Part 1) The quadratic equation has zero real solutions

Part 2) The solutions are

$x_1=-4+2i$ and $x_2=-4-2i$

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^{2}+8x+20=0$

$a=1\\b=8\\c=20$

The discriminant is equal to

$D=(b^{2}-4ac)$

If D=0 -----> the quadratic equation has only one real solution

If D>0 -----> the quadratic equation has two real solutions

If D<0 -----> the quadratic equation has two complex solutions

Find the value of D

$D=8^{2}-4(1)(20)=-16$ -----> the quadratic equation has two complex solutions

Find out the solutions

substitute the values of a,b and c in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(20)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{-16}} {2}$

Remember that

$i=\sqrt{-1}$

$x=\frac{-8(+/-)4i} {2}$

$x_1=\frac{-8(+)4i} {2}=-4+2i$

$x_2=\frac{-8(-)4i} {2}=-4-2i$

8 0

3 years ago

What is the slope intercept form for a line whose slope is 3 and passes through (-4,9)

noname [10]

. Given that the slope of a line is 3 and the line passes through the point (-2,4)

4 0

3 years ago

Read 2 more answers

Find the measure of the angle that is 15x.

Naddika [18.5K]

15x would be the vertical angle of 16x -8 and since vertical angles are equal, then 15x = 16x -8.

15x = 16x -8
x = 8 and so the angle 15x = 15 * 8
which equals 120 degrees.

8 0

3 years ago