Help me with this please

Answer:

Option A

Step-by-step explanation:

[tex]A=\begin{bmatrix}-3 & -9 & -3\\ -4 & -3 & 9\\ 7 & 9 & -10\end{bmatrix}[/tex]

[tex]-7A=\begin{bmatrix}21 & 63 & 21\\ 28 & 21 & -63\\ -49 & -63 & 70\end{bmatrix}[/tex]

[tex]B=\begin{bmatrix}9 & 1 & 6\\ 3 & -10 & 5\\ -1 & 9 & -9\end{bmatrix}[/tex]

[tex]-4B=\begin{bmatrix}-36 & -4 & -24\\ -12 & 40 & -20\\ 4 & -36 & 36\end{bmatrix}[/tex]

[tex]-7A-4B=\begin{bmatrix}-15 & 59 & -3\\ 16 & 61 & -83\\ -45 & -99 & 106\end{bmatrix}[/tex]

Option A is the answer.

Answer:

y=-3x-7

Step-by-step explanation:

the line is currently in standard form (ax+by=c). Let's put it into slope-intercept form (y=mx+b)

-x+3y=9

add x to both sides

3y=x+9

divide by 3

y=1/3x+3

perpendicular lines have slopes that when multiplied, equal -1.

to find the slope (m) of our new line:

1/3m=-1

multiply by 3

m=-3

the slope of the new line is -3

here's our equation so far:

y=-3x+b

we need to find b (y intecept)

since the line passes through the point (-3,2), it should be a solution in the equation (plug it in, and the result is a true statement). We can also use it to find b

so, substitute the pointt into the equation:

2=-3(-3)+b

multiply

2=9+b

subtract

-7=b

so the equation of the line is y=-3x-7

Hope this helps!

Answer:

Step-by-step explanation:

24/9=2.66

9/22=.409

they are not equal.

fraction form 24/9= 2 6/9 simplified to 2 2/3

Answer:

No, 24/9 ≠ 9/22

Step-by-step explanation:

The product of cross multiplying would be 1 if they were equal, of which it isn't and thus they are not.

No calculator is needed unlike answers others have given...

28

The outlier would be 28 because it is much lower than the rest of the numbers in the group and removing it would make the mean increase.

Step-by-step explanation:

the lower quartile is the value of the middle of the first set of numbers, the upper quartile is the middle of the second set.

for example: 2 2 5 (7 )2 0 9

the seven is the median.

upper quartile would be the zero.

and lower quartile would be the second two.

hope this helps!

Answer:

12

Step-by-step explanation:

Im assuming that 15 is the hyp. of the triangle.

Multiply 9 twice and 15 twice

Then subtract 225-81 and you get 144. Find the square root and you get 12.

Answer:

135

Step-by-step explanation:

A tutor charges 30.00$ for two hours of tutoring how much money would the tutor make in nine hours

Answer:

60.00

Step-by-step explanation:

30.00 x 2 = well first your going to multiply 2 and 30 and you get 60 and just add the 2 0s so that would be 60.00

Answer:

(0, -8) and (8, -6) are two points on the graph.

Step-by-step explanation:

Answer:

sin^-1 square root 2/2

=90

Answer:

Step-by-step explanation:

2x > -7

x > -7/2

if x > -7/2      2x+7

if x = -7/2      0

if x< -7/2       -2x-7

x-4+7>0

x+3 > 0

x > -3

If x > -3        (x-4)+7    

if x = -3          0

if x< -3         (-x+4)-7

Answer:

[tex]7w+5s\leq 400[/tex]

Step-by-step explanation:

Money to be spent is not more than $400.

Cost of a case of water = $7

Cost of each sandwich = $5

Let number of cases of water bought be [tex]w[/tex]

Number of sandwiches bought be [tex]s[/tex]

From the question we get

[tex]7w+5s\leq 400[/tex]

The inequality which would determine how many sandwiches, and how many cases of water that can be bought is [tex]7w+5s\leq 400[/tex].

Answer:Katie is 100 cm tall and is standing so that her mother's shado covers her shadow. She is 90 cm from her mother and her mother's shadow is 225cm long. How tall is her mother?

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

Answer: (-6,2)

-8 + (-4) / 2 = -6

-6 + 10 / 2 = 2

Answer:

M = (-6,2)

Step-by-step explanation:

To find a midpoint, you add the x-coordinates and divide by 2 to get the new x coordinate and then add the y-coordinates and divide by 2 to get the new y-coordinate.

(-8 + -4) /2 = x of M

(-6 + 10)/2 = y of M

M = (-6, 2)

Answer:$60.94

Step-by-step explanation:

49.87+11.07(the total of tax plus tip)=60.94

Answer:

maybe c

Step-by-step explanation:

Answer: Alternate interior angles have the same measure. As we know that 'angle 1 ' and 50° are alternate interior angles hence they must be equal. Also we now that sum of all the angles of a triangle is equal to 180°. Hence, m∠2=15°.

Step-by-step explanation:

Answer:

m=2 :)

Step-by-step explanation:

8+7m+5=27

13+7m=27

27-13=14

7m=14

m=2

M=2

[tex]8 + 7m + 5 = 27[/tex]

[tex]8 + 7m= 27 - 5[/tex]

[tex]8 + 7m = 22 [/tex]

[tex]7m = 22 - 8[/tex]

[tex]7m = 14[/tex]

[tex]14 \div 7m \\ = 2[/tex]

Answer:

1 hour

Step-by-step explanation:

Answer:

480 calories

Step-by-step explanation:

4 ÷ 3/4= 5 1/3 servings

90 x 5 1/3= 480

Answer:

the correct answer is d.

Step-by-step explanation:

i hope this helps :)

Answer:

D.

Step-by-step explanation:

The line crosses the x-axis at 4 and the y-axis at -2.

Answer: D.

Answer:

X = -14, Y = -79

Step-by-step explanation:

The two equations both equal Y, a constant, so they can be set to each other.

Find y by plugging -14 into X in either of the equations.

Side note: capitalized variables are generally unpreferred, hope your teacher stops using them! ;)

Answer:

78.5 yards

Step-by-step explanation:

Essentially, to find the area of a circle simply use the equation pi r^2 (r=radius, or half of diameter). They also make it really easy by saying we may use 3.14 for pi, so really, we simply have to solve:

(3.14)5^2=78.5 yards

Hope this helps!

Step-by-step explanation:

You want to calculate the interest on $2730 at 4.2% interest per year after 5,000 year(s).

The formula we'll use for this is the simple interest formula, or:

Where:P is the principal amount, $2730.00.

r is the interest rate, 4.2% per year, or in decimal form, 4.2/100=0.042.

t is the time involved, 5....year(s) time periods.

So, t is 5....year time periods.

To find the simple interest, we multiply 2730 × 0.042 × 5 to get that:

The interest is: $573.30

Answer:

To see if a table of values represents a linear function, check to see if there's a constant rate of change. If there is, you're looking at a linear function!

Step-by-step explanation:

Answer:

3 bags

Step-by-step explanation:

Answer:2x+15+6x-37/2=3x+5

We move all terms to the left:

2x+15+6x-37/2-(3x+5)=0

We add all the numbers together, and all the variables

8x-(3x+5)+15-37/2=0

We get rid of parentheses

8x-3x-5+15-37/2=0

We multiply all the terms by the denominator

8x*2-3x*2-37-5*2+15*2=0

We add all the numbers together, and all the variables

8x*2-3x*2-17=0

Wy multiply elements

16x-6x-17=0

We add all the numbers together, and all the variables

10x-17=0

We move all terms containing x to the left, all other terms to the right

10x=17

x=17/10

x=1+7/10

The value of RS is 31.

An expression contains one or more terms with addition, subtraction, multiplication, and division.

We always combine the like terms in an expression when we simplify.

We also keep all the like terms on one side of the expression if we are dealing with two sides of an expression.

Example:

1 + 3x + 4y = 7 is an expression.

3 + 4 is an expression.

2 x 4 + 6 x 7 – 9 is an expression.

33 + 77 – 88 is an expression.

We have,

If RS and UT are parallel, then their corresponding sides are proportional. Thus,

RS/UT = (2x + 15)/(6x - 37)

Now,

RS/UT = (2x + 15)/(6x - 37)

Cross-multiplying.

(2x + 15)UT = RS(6x - 37)

Expanding and simplifying.

2xUT + 15UT = 6xRS - 37RS

Rearranging.

6xRS - 2xUT = 15UT + 37RS

Factorizing.

2x(3RS - UT) = 15UT + 37RS

Dividing both sides by (3RS - UT):

2x = (15UT + 37RS)/(3RS - UT)

Substituting RS = 2x + 15 and UT = 6x - 37:

2x = (15(6x - 37) + 37(2x + 15))/(3(2x + 15) - (6x - 37))

Simplifying

2x = (90x - 555 + 74x + 555)/(6x + 36)

2x = (164x)/(6x + 36)

Multiplying both sides by (6x + 36):

12x² + 72x = 164x

Simplifying

12x² - 92x = 0

Factoring out 4x.

4x(3x - 23) = 0

So,

x = 0 or x = 23/3.

Since x cannot be 0 (as it would make UT = -37, (which is not possible),

x = 23/3.

Substituting this value of x into RS = 2x + 15.

RS = 2(23/3) + 15 = 31

Thus,

The value of RS is 31.

Learn more about expressions here:

https://brainly.com/question/3118662

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Answer:

a

Step-by-step explanation:

Answer:

Aa

Step-by-step explanation: