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igor_vitrenko [27]
3 years ago
15

Evaluate the expression when a = -3 and c=4. a-3c​

Mathematics
2 answers:
zlopas [31]3 years ago
7 0
-3-3(4)
-3-12=-15

Answer: -15


Hope this helps!
omeli [17]3 years ago
3 0

Answer:

Step-by-step explanation:

c=1/4(A-3c)

4c = A-3c

7c = A

c = A/7

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Hitman42 [59]
I would say A (7) but I’m not 100% sure.
5 0
2 years ago
Add an intersection the red light times normally distributed by the mean of three minutes and a standard deviation of .25 minute
Soloha48 [4]

95% of red lights last between 2.5 and 3.5 minutes.

<u>Step-by-step explanation:</u>

In this case,

  • The mean M is 3 and
  • The standard deviation SD is given as 0.25

Assume the bell shaped graph of normal distribution,

The center of the graph is mean which is 3 minutes.

We move one space to the right side of mean ⇒ M + SD

⇒ 3+0.25 = 3.25 minutes.

Again we move one more space to the right of mean ⇒ M + 2SD

⇒ 3 + (0.25×2) = 3.5 minutes.

Similarly,

Move one space to the left side of mean ⇒ M - SD

⇒ 3-0.25 = 2.75 minutes.

Again we move one more space to the left of mean ⇒ M - 2SD

⇒ 3 - (0.25×2) =2.5 minutes.

The questions asks to approximately what percent of red lights last between 2.5 and 3.5 minutes.

Notice 2.5 and 3.5 fall within 2 standard deviations, and that 95% of the data is within 2 standard deviations. (Refer to bell-shaped graph)

Therefore, the percent of  red lights that last between 2.5 and 3.5 minutes is 95%

8 0
3 years ago
How much do you need to subtract from 87/10 to make 8
Brut [27]

Answer:

You would have to subtract 7/10

Step-by-step explanation:

87/10 - 7/10 would equal 8

3 0
3 years ago
What is the answer to this function p(15)=-2(x-9)^2+100
vovangra [49]

Answer:

28

Step-by-step explanation:

p(x)=-2(x-9)^2+100

Let x= 15

p(15)=-2(15-9)^2+100

Parentheses first

      = -2 ( 6) ^2 + 100

Then exponents

     = -2 * 36 + 100

Then multiply

    = -72 + 100

Then add

   =28

4 0
3 years ago
Giving brainly to correct answer
katovenus [111]

I think the last one is the right one

4 0
2 years ago
Read 2 more answers
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