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3 years ago

20 is how much less than 30? What percent less?

Mathematics

1 answer:

LenKa [72]3 years ago

7 0

Answer:

33.3333% decrease

Step-by-step explanation:

Percent change formula: $\frac{(x-y)}{|y|} *100$ , where x is the new value and y is the starting value.

Plug in values and solve:

$\frac{20-30}{30} *100\\\frac{-10}{30} *100\\-0.3333*100\\$

-33.3333% change, or a 33.3333% decrease.

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Can someone please explain how to do these?

Pani-rosa [81]

Answer:

First question answer: The limit is 69

Second question answer: The limit is 5

Step-by-step explanation:

For the first limit, plug in $x=8$ in the expression $(9x-3)$ , that's the answer for linear equations and limits.

So we have:

$9x-3\\9(8)-3\\72-3\\69$

The answer is 69

For the second limit, if we do same thing as the first, we will get division by 0. Also indeterminate form, 0 divided by 0. Thus we would think that the limit does not exist. But if we do some algebra, we can easily simplify it and thus plug in the value $x=1$ into the simplified expression to get the correct answer. Shown below:

$\frac{x^2+8x-9}{x^2-1}\\\frac{(x+9)(x-1)}{(x-1)(x+1)}\\\frac{x+9}{x+1}$

Now putting 1 in $x$ gives us the limit:

$\frac{x+9}{x+1}\\\frac{1+9}{1+1}=\frac{10}{2}=5$

So the answer is 5

3 0

2 years ago

I'll give 20 p to whoever answers 10-16 :D

BartSMP [9]

This is so easy. You should try before posting a question on this site. No offense.

Having said that im still here to help :)

10. 4,2 -3,5
11. Sorry dont know this one
12. Plot a point at -3,-4 label is Resturant
13. Plot a point at 0,-3 label it Beth

I will only post these ones, The others are extremely simple.

6 0

3 years ago

4. Determine whether the statement is true or false. Prove the statement directly from the definition if it is true, and give a

natta225 [31]

Answer:

The statement is false.

Step-by-step explanation:

Let a and b represent two odd integers.

The average (A) is defined by:

A= $\frac{a+b}{2}$

In order to prove the statement, you have to show that it's true for all odd integers. But, to disprove it, you just have to find a counterexample where the statement is false.

Notice that it is easier to try to find a counterexample.

For example, a=3 and b=5

A= $\frac{3+5}{2} = \frac{8}{2} = 4$

The result of the average is even, therefore the statement is false.

The previous calculation is a counterexample.

3 0

2 years ago

Please help me with 13-20 but I need help with 13-18 to find x because its hard for me and 19-20 to find BC and find triangle PQ

AveGali [126]

We are seeing 30, 60, 90, triangles, and 45, 45, 90, triangles.
13. 3 root 3
14. 5 root 2
15. 7/2 root 2
16. 3/2 root 2
17. 7.5 root 3
19. bc is squared root 37
20. 32 + 32 root 3

5 0

2 years ago

How do you do this. It does not make since

Anon25 [30]

Answer: n=15

Step-by-step explanation:

To find the perimeter, you add all of the side lengths together. This would make the equation 28+28+n+n. You already know the perimeter and are trying to find n. Your new equation is 28+28+n+n=86

You would then combine the like terms and get

56+2n=86

Then you would subtract 56 from both sides and get

2n=30

Finally, you want to divide both sides by 2 in order to get n alone. 30/2 is 15. Therefore,

N=15

6 0

2 years ago