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3 years ago

Liz is putting wallpaper on a 9-foot by 12foot wall. The roll of wallpaper is 30 inches wide. What is the area

1 answer:

6 0

The wall is 9 ft by 12 ft.
9 × 12 = 108

The area of the wall is 108 ft².

Not sure what the width of the wallpaper is for <:(

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Which is a good comparison of the estimated sum and the actual sum of 7 9/12 + 2 11/12

Verizon [17]

7 + 2 = 9 and 9/12 + 11/12 = 20/12 = 1 8/12 = 1 2/3

9 + 1 2/3 = 10 2/3

4 0

2 years ago

Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.

diamong [38]

Answer:

A-2, B-DNE*, C-3, D-DNE, E-4, F-1

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The first attachment shows the solutions to A and C.

The second attachment shows the solutions to E and F.

There are no real number solutions to systems B and D.

_____

In general, you can solve the linear equation for y, then substitute that into the quadratic. You can subtract the x-term on the left and complete the square to find the solutions.

(3-x) +12 = x^2 +x

15 = x^2 + 2x

16 = x^2 +2x +1 = (x +1)^2 . . . . add the square of half the x-coefficient to complete the square; next take the square root

±4 -1 = x = {-5, 3) . . . . . identifies the second solution set for system A

(x -1) -15 = x^2 +4x

-16 = x^2 +3x

-13.75 = x^2 +3x +2.25 = (x +1.5)^2

roots are complex: -1.5 ±i√13.75

(1-2x) +5 = x^2 -3x

6 = x^2 -x

6.25 = x^2 -x + .25 = (x -.5)^2

±2.5 +.5 = x = {-2, 3} . . . . . identifies the third solution set for system C

remaining problems are done in a similar way.

_____

* DNE = does not exist. There is no matching solution set for the complex numbers that are the solutions to this.

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Hope this helps!

Brainliest would be great!

---------------------

With all care,

07x12!

4 0

3 years ago

Round 249798.828806 to the nearest ten.

Artyom0805 [142]

249798.8

The nearest ten

5 0

2 years ago

Read 2 more answers

Tim must read 2 books from a list of 7 recommended books for his summer reading program. In how many different ways can Tim choo

Marianna [84]

There are 21 ways Tim choose 2 books from the 7 recommended book

Solution:

Given that Tim must read 2 books from a list of 7 recommended books for his summer reading program

To find: different ways can Tim choose 2 books from the 7 recommended books

This is a combination problem

A combination is a selection of all or part of a set of objects, without regard to the order in which objects are selected

The formula for combinations is:

$n C_{r}=\frac{n !}{r !(n-r) !}$

where n represents the number of items, and r represents the number of items being chosen at a time

Here we have to choose 2 books from 7 books

Therefore, n = 7 and r = 2

Substituting values in above formula, we get

$\begin{aligned}&7 C_{2}=\frac{7 !}{2 !(7-2) !}\\\\&7 C_{2}=\frac{7 !}{2 ! \times 5 !}\end{aligned}$

For a number n, the factorial of n can be written as,

$n !=n \times(n-1) \times(n-2) \dots \dots \times 2 \times 1$

Therefore, we get

$7 C_{2}=\frac{7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1}{2 \times 1 \times 5 \times 4 \times 3 \times 2 \times 1}\\\\7C_2 = 7 \times 3 = 21$

Thus there are 21 ways Tim choose 2 books from the 7 recommended book

7 0

3 years ago

Which is used to find the number of ways a given number of objects can be ordered? need help asap please im between factorial an

raketka [301]

Factorial is the correct answer because in combinations the order does not matter

8 0

3 years ago

Read 2 more answers