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Bumek [7]
3 years ago
14

−1.5(4−n)+2.8 how to solve this problem

Mathematics
2 answers:
sineoko [7]3 years ago
7 0
To solve this problem,all you can do is simplify. First use the distributive property:

-1.5 * 4= -6
-1.5* n= -1.5n
now you should have this:

-6-1.5n+2.8

Now combine like terms:

-6+2.8= -3.2

Now you have simplified it as much as you can:

-3.2-1.5n is your answer. 

melisa1 [442]3 years ago
3 0
3.2n is your answer for number of ns
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How do you solve 2w-10=20
Aloiza [94]

2w-10=20

Add 10 to both sides

2w=30

Divide both sides by 2

w=15

3 0
4 years ago
In a statistics class there are 18 juniors and 10 seniors; 6 of the seniors are females and 12 of the juniors are males. If a st
White raven [17]

Answer:

a) 0.857

b) 0.571

c) 1

Step-by-step explanation:

Based on the data given, we have

  • 18 juniors
  • 10 seniors
  • 6 female seniors
  • 10-6 = 4 male seniors
  • 12 junior males
  • 18-12 = 6 junior female
  • 6+6 = 12 female
  • 4+12 = 16 male
  • A total of 28 students

The probability of each union of events is obtained by summing the probabilities of the separated events and substracting the intersection. I will abbreviate female by F, junior by J, male by M, senior by S. We have

  • P(J U F) = P(J) + P(F) - P(JF) = 18/28+12/28-6/28 = 24/28 = 0.857
  • P(S U F) = P(S) + P(F) - P(SF) = 10/28 + 12/28 - 6/28 = 16/28 = 0.571
  • P(J U S) = P(J) + P(S) - P(JS) = 18/28 + 10/28 - 0 = 1

Note that a student cant be Junior and Senior at the same time, so the probability of the combined event is 0. The probability of the union is 1 because every student is either Junior or Senior.

3 0
3 years ago
Simplify the expression:<br> –9w+–6w+10w+8w
Y_Kistochka [10]

Final Answer: 3w

Steps/Reasons/Explanation:

It is common addition and subtraction because they all have w after the number. This means they are the same variable. A plus minus (+-) would be a minus (-).

Question: Simplify the expression: -9w +- 6w + 10w + 8w.

<u>Step 1</u>: Simplify.

-9w - 6w + 10w + 8w

<u>Step 2</u>: Simplify.

3w

~I hope I helped you :)~

4 0
3 years ago
Please help! find the value of x
Serga [27]
I needed points sorry
4 0
3 years ago
Read 2 more answers
Jane is 5 times older than her sister. In 3 years, Jane’s sister will be 1/4 her age. Find the ages now
Korolek [52]

The present age of Jane is 45 years old and present age of her sister is 9 years old

<em><u>Solution:</u></em>

Let the present age of Jane be "x"

Let the present age of her sister be "y"

<em><u>Jane is 5 times older than her sister</u></em>

present age of Jane = 5(present age of her sister)

x = 5y ---------- eqn 1

<em><u>In 3 years, Jane’s sister will be 1/4 her age</u></em>

Age of sister after 3 years = 3 + y

Age of jane after 3 years = 3 + x

Age of sister after 3 years = 1/4(age of jane after 3 years)

3 + y = \frac{1}{4}(3 + x)

Substitute eqn 1 in above equation

3 + y = \frac{1}{4}(3 + 5y)\\\\12 + 4y = 3 + 5y\\\\5y - 4y = 12 - 3\\\\y = 9

Substitute y = 9 in eqn 1

x = 5(9)

x = 45

Thus present age of Jane is 45 years old and present age of her sister is 9 years old

3 0
4 years ago
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