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2 years ago

If ab means ab², what is the value of 54

Mathematics

2 answers:

suter [353]2 years ago

8 0

Answer:

hhuh eud e uue dui7d iiit

Amiraneli [1.4K]2 years ago

3 0

Answer:

400

Step-by-step explanation:

5x4=20,

20^2=400.

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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

Select the correct numerator 7/9 - ?/27

damaskus [11]

Answer:

Step-by-step explanation:

27÷3 is 9 and 21÷3 is 7

7 0

3 years ago

Lxl=10 what is the answer

Svetradugi [14.3K]

Answer:

Step-by-step explanation:

The absolute value of 10 is 10. Algebraically speaking, the absolute value of a number x takes x and makes it positive.

6 0

2 years ago

10x+9=4x -9 solve please help

Neporo4naja [7]

Answer:

x = -3

Step-by-step explanation:

To solve this, you need to isolate the variable x, this means only one side of the equation should have the variable x. To do this, you need to do the opposite operation from what's given (if it's addition, use subraction; if it's multiplication, use division; these work vise versa)

Subtract 9 from both sides of the equation. This gives you 10x = 4x - 18.
Subtract 4x from both sides of the equation. This gives you 6x = -18.
Divide both sides by 6. This gives you x = -3

The final answer is x = -3

7 0

2 years ago

0.933333 as a fraction show work

Art [367]

Answer:

84/90

Step-by-step explanation:

Let 0.9333....... be x.

10x = 9.3333....... & 100x = 93.33333.......

So,

=> 100x - 10x = 93.33333...... - 9.333333.....

=> 90x = 84

=> x = 84/90

6 0

3 years ago

Read 2 more answers

If a*b means ab², what is the value of 5*4​

If ab means ab², what is the value of 54