3 years ago

Help i don’t understand this

1 answer:

5 0

Infinite many solutions is when you can put any number in X and it will be true, therefore both equations must be the same:

73x + 71 = 73x + 71

P = 71 and Q = 73

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Enny White is shopping for CDs. She decides to purchase 3 movie soundtracks. The music store has 7 different movie soundtracks i

zubka84 [21]

Answer:

$35\ ways$

Step-by-step explanation:

we know that

Combinations are a way to calculate the total outcomes of an event where order of the outcomes does not matter.

To calculate combinations, we will use the formula

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

where

n represents the total number of items

r represents the number of items being chosen at a time.

In this problem

$n=7\\r=3$

substitute

$C(7,3)=\frac{7!}{3!(7-3)!}\\\\C(7,3)=\frac{7!}{3!(4)!}$

simplify

$C(7,3)=\frac{(7)(6)(5)4!}{3!(4)!}$

$C(7,3)=\frac{(7)(6)(5)}{3!}$

$C(7,3)=\frac{(7)(6)(5)}{(3)(2)(1)}$

$C(7,3)=35\ ways$

6 0

4 years ago

the ratio of boys to girls at a local sports club is 3 to 1. If there are 45 girls, how many boys are there?

viva [34]

Answer:

Step-by-step explanation: for you to get the answer you have to understand that 3 to 1 means to multiply by 3 so 45x3=135

6 0

3 years ago

Read 2 more answers

How do you solve y=x-3 and Y= -x +5

artcher [175]

Answer:

The answer is 4

Step-by-step explanation:

Set them equal so it would be X-3= -X+5 then add the negative X to get

2x-3=5 then add the -3 to 5 and get

2x=8 then divide 2 from both sides to get

x=4

5 0

4 years ago

Use properties of exponents to solve for a and b in the problem below. No calculator allowed. Please help; I don't know what I'm

Ostrovityanka [42]

A= 7843/324b. i think it might be that, not so sure

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3 years ago

Find the expression as the cosine of an angle cos pi/4 cos pi/9 - sin pi/4 sin pi/9

Vlad1618 [11]

Answer: cos(13pi/36)

Step-by-step explanation: just did the assignment

4 0

3 years ago