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Mila [183]
3 years ago
15

a electronic store sells a certain digital camera for $126. this is 2/3 of the price that a photography store charges. what is t

he cost of the camera at the photography store?
Mathematics
1 answer:
never [62]3 years ago
4 0

Let us assume the cost of the camera at the photography store = $x.

We are given $126 is 2/3 of the price that a photography store charges.

Let us repharse above statement "$126 is 2/3 of the store price x".

Let us convert above statement in an equation now.

126 = 2/3 of x.

126 = 2/3 x.

Dividing both sides by 2/3, we get

126 ÷ 2/3 =2/3 x ÷ 2/3.

126 × 3/2 = x

378/2 =x.

x= 189.

Therefore, the cost of the camera at the photography store is $189.


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If f x = 7x<br><br> 2 − 4x − 10, then f −3 =?
Schach [20]

Answer:

f(x)=xy3 -4xy2 -7x+10

Step-by-step explanation:

the xy3 and xy2 means x to the 3rd power and x to the second power

7 0
3 years ago
A toy manufacturer wants to know how many new toys children buy each year. A sample of 1492 children was taken to study their pu
julia-pushkina [17]

By assuming the standard deviation of population 2.2 the confidence interval is 8.67 toys,8.94 toys.

Given sample size of 1492 children,99% confidence interval , sample mean of 8.8, population standard deviation=2.2.

This type of problems can be solved through z test and in z test we have to first find the z score and then p value from normal distribution table.

First we have to find the value of α which can be calculated as  under:

α=(1-0.99)/2=0.005

p=1-0.005=0.995

corresponding z value will be 2.575 for p=0.995 .

Margin of error=z*x/d

where x is mean and d is standard deviation.

M=2.575*2.2/\sqrt{1492}

=0.14

So the lower value will be x-M

=8.8-0.14

=8.66

=8.67 ( after rounding)

The upper value will be x+M

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=8.94

Hence the confidence interval will be 8.67 toys and 8.94 toys.

Learn more about z test at brainly.com/question/14453510

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8 0
2 years ago
Wilhelmina wrote a check for $72 to pay her monthly Internet bill, but when
lesantik [10]

Answer:

her bank statement will show that she has $144 less than her checkbook balance

Step-by-step explanation:

let the amount of money in the bank before writing the check be x

after writing the check for $72, because she accidentally recorded this as a credit, here checkbook will reflect a balance of :$(x + 72)

However, the bank correctly records the debit of the $72, resulting  a balance of: $(x-72)

Hence compared to her checkbook,  the bank records will show an amount difference of :

(x-72) - (x + 72)

= x - 72 -x -72

= -144

i.e her bank statement will show that she has $144 less than her checkbook balance

3 0
3 years ago
Read 2 more answers
Use parallelogram ABCD. What are the values of x and y?<br><br> x = <br> y =
Tasya [4]

Answer:

x = 17 and y = 10

Step-by-step explanation:

ABCD is a parallelogram

So AB = CD and AD = BC

so

3x - 9 = 42

3x = 51

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and

4y - 3 = 37

4y = 40

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Answer

x = 17 and y = 10

6 0
3 years ago
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Someone help please! :)
Tema [17]
The domain of a function refers to the interval of x values where the graph is defined. In order for the function to be at least 600, the x values must be between 0 and 20. 

The answer is:

0 \leq x \leq 20
4 0
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