Hi help rn plss<br> this is a system of equations question

A rational expression simplifies to 1/2.

Ket [755]

The answer is D. It will equal 1/2 when you solve.

6 0

3 years ago

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Select each pair of functions that are inverses of each other

svlad2 [7]

Answer:

The first two choices only: A and B.

Step-by-step explanation:

The inverses are the ones with one relation having point (x,y) and the other relation having point (y,x). This most obvious when looking at points on a table or a list of points.

So the first pair are inverses because per point (x,y) on the first list you have (y,x) on the second list.

Examples:

1st list contains (-5,-9) while second list contains (-9,-5).

1st list contains (3,7) while the second list contains (7,3).

As long as (a,b) is in the first list and (b,a) is in the second or vice versa, then the pair of relations are inverses. So the first choice contains inverses.

Now lets talk about the pair of functions given in function notation.

Let's start with the first.

y=x+7

Extend the first idea more. Just swap x and y and then see after solving for y if what it equals is what g equals then f and g are inverses in the second choice.

x=y+7

Subtract 7 on both sides:

x-7=y

y=x-7

This is what g equals so the second choice is an answer.

The last choice does not contain a pair of inverses. Example: (2,3) is in the first list but (3,2) is not in the second.

6 0

3 years ago

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A seller has acquired 120 randomly selected items from a vendor for his stores. He has an allowance of 10% for damaged items. Of

wariber [46]

Answer:

Step-by-step explanation:

Given that a seller has acquired 120 randomly selected items from a vendor for his stores. He has an allowance of 10% for damaged items. Of the 120 items acquired from the vendor, the seller found that 15 are damaged.

Population proportion= 0.10

Sample proportion = 15/120 = 0.125

To test whether the population proportion of the vendor's items exceeds the seller's allowable limit,

the hypotheses would be

$H_0: p = 0.10\\H_a: p >0.10$

(right tailed test)

7 0

4 years ago

At a school. Number of boys:number of girls=11:9. There are 124 more boys than girl. Work out the total number of students at th

JulsSmile [24]

Answer:

Total students = 1240

Step-by-step explanation:

Given that,

Number of boys: number of girls=11:9

$\dfrac{x}{y}=\dfrac{11}{9}\\\\9x=11y$ ......(1)

There are 124 more boys than girls i.e.

x = 124+y .....(2)

Put the value of x from equation (2) in equation (1). So,

9(124+y) = 11y

1116 +9y = 11y

1116 = 2y

y = 558

Put the value of y in equation (2).

x = 124+558

x = 682

Total students = x+y

= 682+558

= 1240

So, there are 1240 students at the school.

5 0

3 years ago

His list shows how many hours twenty batteries lasted when they ran continually in a flashlight. 78 31 47 51 16 58 60 10 30 40 4

Lynna [10]

<span>b. mean: 46.85 median: 47 mode: 10, 47, 93</span>

4 0

4 years ago

Hi help rn plss this is a system of equations question