12x - 3x + 11 3 4x - (17 - 9x)

Mathematics

2 answers:

KengaRu [80]3 years ago

8 0

sorry it won't let me show step by step but your answer is 150x-17

Irina-Kira [14]3 years ago

7 0

Answer:

I’m not really sure what’s the problem but I searched it,, hope that helps

Step-by-step explanation:

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160 bananas; 20% decrease

Kay [80]

First you turn 20% into a decimal by dividing by 100 and you get .20
then you multiply .20 by 160 and get 32
then subtract:
160-32=128
So if you have 120 bananas and you have a 20% decrease then you would have 128 left over

Hope this helped!! :D

3 0

4 years ago

The average age of a preschool class is 4.5 years old. If there is one 3-year-old, five 5-year-olds, and two other children both

kompoz [17]

Answer:

3.1

Step-by-step explanation:

5 x5 =25

25+3=28

8 0

3 years ago

Read 2 more answers

Suppose in the University of Manitoba, 40% of the students live in apartments. If 600 students are randomly selected, then the a

just olya [345]

Answer:

$P(200\leq X\leq 400)=P(\frac{200-240}{12}\leq \frac{X-\mu}{\sigma}\leq \frac{400-240}{12})=P(-3.33\leq Z \leq 13.33)$

$=P(Z$

So then the correct answer would be:

B) .9996

Step-by-step explanation:

The exact way to solve this problem is using the binomial distribution, assuming that our random variable of interest is "number of students living in apartments" represented by X and $X \sim Bin(n=600, p =0.4)$

And we want this probability:

$P(200 \leq X \leq 400) [tex]In order to find this probability we can use the foloowing excel code:"=BINOM.DIST(400,600,0.4,TRUE)-BINOM.DIST(199,600,0.4,TRUE)"And we got:[tex] P(200 \leq X \leq 400) =0.999675[tex]But for this case the problem says that we need to approximate, so then we can use the normal approximation to the normal distribution. We need to check the conditions in order to use the normal approximation.
[tex]np=600*0.4=240\geq 10$