All categories

2 years ago

Simplify.

Mathematics

2 answers:

Trava [24]2 years ago

4 0

Answer:

1. 80

2. 30

3. 15

Step-by-step explanation:

1. 9^2=81 ...81-1=80

2. 4^2= 16 so..10(19-16)-> 10(3)= 30

3. 3^2= 9 so... 7+9-1-> 7+9=16 16-1=15

umka21 [38]2 years ago

3 0

Step-by-step explanation:

9^2-1

(9×9)-1

81-1

10(19-4^2)

10(19-16)

10(3)

You might be interested in

The following list shows how many brothers and sisters some students have: 3, 4, 3, 5, 6, 2, 5, 4, 5, 4, 6, 5, 3 State the mode.

omeli [17]

I believe the mode is 5 because there are four 5’s which is the most of a certain number in this list.

8 0

2 years ago

What is the determinant of the coefficient matrix of this system? <br> 4x-3y=-8 <br> 8x-3y=12

gladu [14]

The coefficient matrix is build with its rows representing each equation, and its columns representing each variable.

So, you may write the matrix as

$\left[\begin{array}{cc}\text{x-coefficient, 1st equation}&\text{y-coefficient, 1st equation}\\\text{x-coefficient, 2nd equation}&\text{y-coefficient, 2nd equation} \end{array}\right]$

which means

$\left[\begin{array}{cc}4&-3\\8&-3\end{array}\right]$

The determinant is computed subtracting diagonals:

$\left | \left[ \begin{array}{cc}a&b\\c&d\end{array}\right]\right | = ad-bc$

So, we have

$\left | \left[\begin{array}{cc}4&-3\\8&-3\end{array}\right] \right | = 4(-3) - 8(-3) = -4(-3) = 12$

8 0

2 years ago

PLEASE HELPPPPPPPPPPPPPP

gregori [183]

Answer:

False

Step-by-step explanation:

To find the inverse of a function, switch the variables and solve for y.

The inverse of f(n)=-(n+1)^3:

$y=-(n+1)^3$

$n=-(y+1)^3$

$\sqrt[3]{n} =-(y+1)$

$\sqrt[3]{n} =-y-1$

$\sqrt[3]{n} +1=-y$ $-(\sqrt[3]{n} +1)=y$

$-\sqrt[3]{n} -1=y$

5 0

2 years ago

Read 2 more answers

Which triangles in the diagram are congruent?

GenaCL600 [577]

Answer: triangle 1, triangle 2, and triangle 3

Step-by-step explanation:

Triangles 1 and 3 are congruent by SAS. So, by CPCTC, all three sides are congruent, making triangle 2 congruent to them as well by SSS.

4 0

1 year ago

What happens to the function f(x)=(x−1)2+1 when it becomes f′(x)=2((x−1)2+1)?

Ymorist [56]

Answer: c

Step-by-step explanation: I took the test

7 0

2 years ago

Read 2 more answers