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2 years ago

If 90 is 30% of a number , what is 200% of the number

Mathematics

1 answer:

9966 [12]2 years ago

3 0

Answer:

600

Step-by-step explanation:

To find 100% we can divide by 30 (to find 1%) then times by 100 (to find 100%)

90÷30=3

3×100=300

100%=300

200%=300×2

200%=600

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Nimfa-mama [501]

First of all, we can observe that

$x^2-6x+9 = (x-3)^2$

So the expression becomes

$\dfrac{x^2-4}{\sqrt{(x-3)^2}} = \dfrac{x^2-4}{|x-3|}$

This means that the expression is defined for every $x\neq 3$

Now, since the denominator is always positive (when it exists), the fraction can only be positive if the denominator is also positive: we must ask

$x^2-4 \geq 0 \iff x\leq -2 \lor x\geq 2$

Since we can't accept 3 as an answer, the actual solution set is

$(-\infty,-2] \cup [2,3) \cup (3,\infty)$

7 0

2 years ago

a laptop was originally sold for $975. The laptop is now on sale for $828.75. what is the percent markdown?

zloy xaker [14]

Answer: 15%

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

you walk into a room.on the bed,there 2 dogs, 4 cat, a girrafe, 5 cows and a duck.there are also three chickens flying above the

Tems11 [23]

Answer:

50 legs

Step-by-step explanation:

We know that a dog has 4 legs, a cat has 4 legs, a giraffe has 4 legs, a duck has 2 legs, and a chicken has 2 legs. So, we want to calculate $2(4)+4(4)+1(4)+5(4)+1(2)+3(2)$ , right?

Wrong! It's a trick question! The chickens aren't on the floor, so they don't count. So, we really want $2(4)+4(4)+1(4)+5(4)+1(2)$ .

We multiply it out to get $8+16+4+20+2$ .

We add these up to get $50$ .

So, our answer is $\boxed{50}$ legs.

6 0

1 year ago

The table displays the frequency of scores for a calculus class on an exam. The mean of the exam scores is 3.5. Score 1 2 3 4 5

vladimir1956 [14]

Answer:

f=11

Mode=4

Median=4

Explanation:

We are given that

a.Mean of the exam score, $\bar x$ =3.5

Score(x) frequency C.F

1 1 1

2 3 4

3 f 15(4+f=4+11)

4 13 28

5 4 32

$\sum f_i=1+3+f+13+4=21+f$

$\sum f_ix_i=1(1)+2(3)+3(f)+4(13)+5(4)=1+6+3f+52+20=79+3f$

$(\bar x)=\frac{\sum f_ix_i}{\sum f_i}$

Using the formula

$3.5=\frac{79+3f}{21+f}$

$73.5+3.5f=79+3f$

$3.5f-3f=79-73.5$

$0.5f=5.5$

$f=\frac{5.5}{0.5}=11$

b.Mode:The number which is repeat most times .

4 repeat most times

Hence, mode of all exam scores=4

N=32

N is even

$Median=\frac{(\frac{n}{2})^{th}+(\frac{n}{2}+1)^{th}}{2}$

Median= $\frac{16th+17th}{2}=\frac{4+4}{2}=\frac{8}{2}=4$

7 0

2 years ago

Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar.

baherus [9]

Answer:

The answer is 1/4 probability because in the first scenario, 4 of the men could he chosen and there are 16 total options.

In the second scenario, there are 2 slots for the men and 8 total slots. This means they have a 1/4 chance of being chosen.

hope this help :>

5 0

2 years ago

Read 2 more answers