MATHEMATICS
HIGH SCHOOL

Answer:

There are 18 students.

MIDDLE SCHOOL

(5 + 4 – 2) × (–2) = ?

(5 + 4 - 2) * -2 = ...do the math in the parenthesis first

7 * -2 =

-14

7 * -2 =

-14

36 is the correct answer

HIGH SCHOOL

What is the definition of center of dilation?

A dilation is a transformation that produces an image that is the same shape as the original, but is a different size. The center of dilation is a fixed point in the plane.

HIGH SCHOOL

Find the product. Simplify if possible. -1/3 * (8 1/7) A. -2 5/7 B. -3/8 C. -1/21 D. 1/3

-1/3×8 1/7

-1/3×57/7

-(1×57)/(3×7)

-57/21

-19/7

B. -2 5/7

-1/3×57/7

-(1×57)/(3×7)

-57/21

-19/7

B. -2 5/7

8 1/7 = (8*7 + 1 ) / 7 = 57 / 7 ;

(-1/3)*(57/7) =(-57/21) = (-57÷3)/(21÷3) = (-19/7);

(-1/3)*(57/7) =(-57/21) = (-57÷3)/(21÷3) = (-19/7);

MIDDLE SCHOOL

Find the ordered pairs for the x- and y-intercepts of the equation 3x − 2y = 18 and select the appropriate option below. The x-intercept is (0, 6); the y-intercept is (–9, 0). The x-intercept is (6, 0); the y-intercept is (0, –9). The x-intercept is (3, 0); the y-intercept is (0, –2). The x-intercept is (0, 3); the y-intercept is (–2, 0).

3x-2y=18

The x-intercept occurs when y=0

3x=18, x=6, so it is the point (6,0)

The y-intercept occurs when x=0

-2y=18, y=-9, so it is the point (0, -9)

"The x-intercept is (6,0); the y-intercept is (0,-9)"

The x-intercept occurs when y=0

3x=18, x=6, so it is the point (6,0)

The y-intercept occurs when x=0

-2y=18, y=-9, so it is the point (0, -9)

"The x-intercept is (6,0); the y-intercept is (0,-9)"

MIDDLE SCHOOL

I don't get this question it says: 54 fl oz = _____ c

Well for every fluid ounce, there is .125 of a cup.

54*.125=6.75

54*.125=6.75

COLLEGE

Select all statements below which are true for all invertible n×nn×n matrices aa and bb a. (ab)−1=a−1b−1(ab)−1=a−1b−1

b. aba−1=baba−1=b

c. (in+a)(in+a−1)=2in+a+a−1(in+a)(in+a−1)=2in+a+a−1

d. a2b7a2b7 is invertible

e. a+ba+b is invertible f. (a+b)(a−b)=a2−b2(a+b)(a−b)=a2−b2

Answer:

The statements that are correct are:

c)

d) is invertible.

e) is invertible.

Step-by-step explanation:

We are given that:

a and b are invertible n×n matrices.

We have to tell which of the following statements are true.

a)

This statement is false.

Since:

and it may not be equal to the term

b)

This expression could also be written as:

Since on Post multiplying by a on both the sides.

But here we don't know whether the matrices are commutative or not.

Hence, the statement is false.

c)

This statement is true.

since,

where in denote the identity matrix.

and we know that:

d)

is invertible.

This statement is true.

Since we know that prodct of invertible matrices is also invertible.

As is invertible so is .

Also is invertible so is .

Hence Product of and is also invertible.

i.e. is invertible.

e)

is invertible.

This statement is true as sum of two invertible matrices is invertible.

f)

This statement is false.

Since,

Now as we are not given that:

Hence, we could not say that:

The correct statements which are true for all invertible are:

(c).

(d). is invertible.

(e). is invertible.

Further Explanation:

Given:

The matrix and are invertible matrices.

Calculation:

(a)

The statement is false.

The statement is false.

(b)

The statement is .

Now multiply by a both the side.

The statement is is false.

(c)

The statement is .

Solve the above equation to check whether it is invertible.

The statement is true.

(d)

The statement is .

The product of invertible matrices is always invertible.

As is invertible so is also invertible.

As is invertible so is also invertible.

Hence, the product of and is also invertible.

The statement is true.

(e)

The statement is true as is always invertible.

(f)

The statement is .

Solve the equation to check the inevitability.

The statement is not true as .

Hence, the correct statements which are true for all invertible are:

(c).

(d). is invertible.

(e). is invertible.

Learn more:

1. Learn more about unit conversion brainly.com/question/4837736

2. Learn more about non-collinear brainly.com/question/4165000

3. Learn more about binomial and trinomial brainly.com/question/1394854

Answer details:

Grade: High School

Subject: Mathematics

Chapter: Linear equation

Keywords: Invertible, matrices, matrix, statement, function, true, determinants, elements, inverse.

MIDDLE SCHOOL

For a printing company, the cost of printing business cards is a linear function, C(x) = 0.05x + 20, where x is the number of cards printed. What is the cost of printing 1200 business cards? PLEASE HELP!!

WHOMEVER ANSWERS FIRST IS BRAINLIEST!

Answer:

80

Step-by-step explanation:

You plug in 1200 for x.

C(1200)=0.05(1200) +20

Then solve. Multiply first then add.

60+20

80

HIGH SCHOOL

What is an expected value? A. Expected value is the probability of losing an event many times. B. Expected value is the probability of winning an event many times. C. Expected value is the estimated gain or loss of partaking in an event many times. D. Expected value is the total estimated cost to partake in an event many times.

Answer:

C. Expected Value is the estimated gain or loss in partaking in an event many times.

Step-by-step explanation:

Expected value also know as mean is the average value of a random variable. It is the probability weighted average of all it's possible values. Usually calculated by

E (x × p) = expected value

Where E = summation

X = variables

P = probabilities for each variable

MIDDLE SCHOOL

Which expression would represent the amount of time it took Lisa to travel 120 miles if she traveled at a speed of s miles per hour?

s is the MPH.

t is the amount of time.

Lisa traveled 120 miles at a speed of s miles, and we want to find t, the time. We need to divide the distance of 120 by the speed of s.

The answer is 120/s = t.