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3 years ago

Solve correctly and I’ll give brainliest.

Mathematics

1 answer:

Lera25 [3.4K]3 years ago

7 0

Answer:

Step-by-step explanation:

-2 x 6 = -12

-6/1 ÷ -3/1 = 2

-12 - 2 = -14

-14 ÷ -2 = 7

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Please help in this math question

iVinArrow [24]

Answer:

b i think

Step-by-step explanation:

3 0

3 years ago

How do u show that these 2 lines are parallel L is y=3x-2 L*2 is 3y-9x+5=0

DIA [1.3K]

Answer:

If two lines are parallel, then they have the same gradient.

Step-by-step explanation:

L is y=3x-2

L*2 is 3y-9x+5=0

The gradient for the first equation is 3

We need to rearrange the second equation and see if it has the same gradient as the first equation.

L*2 is 3y-9x+5=0

3y = 9x - 5

L*2 y = 3x - 5/3

As you can see, once you rearrange and simplify the equation, the second line has the same gradient as the first equation.

So that means these two lines are parallel

4 0

4 years ago

Please Help! 30 POINTS! Given the following three points, find by hand the quadratic function they represent. (−1,−8), (0,−1),(1

ycow [4]

Answer:

(1) B

(2) D

Step-by-step explanation:

(1)

Let the quadratic function be:

$y = ax^{2} + bx + c$

For the point, (0,-1),

$y = ax^{2} + bx + c$

$-1=(a\times0)+(b\times0}+c\\-1=c\\c=-1$

Then the equation is:

$y = ax^{2} + bx -1$

For the point (-1, -8) ,

$y = ax^{2} + bx -1$

$-8=(a\times (-1)^{2})+(b\times -1)-1\\-8=a-b-1\\a-b=-7...(i)$

For the point (1, 2) ,

$y = ax^{2} + bx -1$

$2=(a\times (1)^{2})+(b\times 1)-1\\2=a+b-1\\a+b=3...(ii)$

Add the two equations and solve for a as follows:

$a-b=-7\\a+b=3\\\_\_\_\_\_\_\_\_\_\_\_\_\_\_\\2a = -4\\a = -2$

Substitute a = -2 in (i) and solve for b as follows:

$a-b=-7\\-2-b=-7\\b=5$

Thus, the quadratic function is:

$f(x)=-2x^{2}+5x-1$

The correct option is (b).

(2)

The ordered pairs are:

(5, 7), (7, 11), (9, 14), (11, 18)

Represent them in an XY table as follows:

X : 5 | 7 | 9 | 11

Y : 7 | 11 | 14 | 18

Compute the difference between the Y values as follows:

Diff = 11 - 7 = 4

Diff = 14 - 11 = 3

Diff = 18 - 14 = 4

Now compute the difference between the Diff values:

d = 3 - 4 = -1

d = 4 - 3 = 1

Since the differences between the differences of the y-values is not consistent, the ordered pairs do not represent a quadratic equation.

The correct option is D.

8 0

3 years ago

Ryan's soccer equipment weighs 6 pounds more than Ken's. If both of their soccer equipment weighs 42 pounds together how much do

mr_godi [17]

Answer:

15 pounds

Step-by-step explanation:

because half of 42 is 21-6 is 15 therefore it all adds up to 42

4 0

3 years ago

Can someone help will give brainlist

Marizza181 [45]

Answer:

720

Step-by-step explanation:

10x9x8

Since they are picking 3 different instruments

please mark me brainliest :)

5 0

3 years ago