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faust18 [17]
3 years ago
12

3x +15=75 what is the value of x​

Mathematics
2 answers:
Alenkasestr [34]3 years ago
7 0
To find x you have to isolate it, so you you subtract 15 to both sides then you get 3x=60 next you divide both sides by 3 and that gives you x=20
kifflom [539]3 years ago
3 0

Answer:

X=20

you subtract 15 from 75 to get 60 then divide 60 by 3 to get 20

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A sample of 11 students using a Ti-89 calculator averaged 31.5 items identified, with a standard deviation of 8.35. A sample of
lina2011 [118]

Answer:

We reject H₀, with CI = 90 % we can conclude that the mean numbers of times identified with Ti-84 does not exceed that of the Ti-89 by more than 1,80

Step-by-step explanation:

Ti-89 Calculator

Sample mean     x = 31,5

Sample standard deviation   s₂  = 8,35

Sample size        n₂ = 11

Ti-84 Calculator

Sample mean     y = 46,2

Sample standard deviation   s₁  = 9,99

Sample size        n₁ = 12

t(s)  = ( y - x - d ) / √s₁²/n₁ + s₂²/n₂

t(s)  = 12,9 / √(99,8/12) + (69,72/11)

t(s)  = 12,9 / √8,32 + 6,34

t(s)  = 12,9 / 3,83

t(s) = 3,37

Test Hypothesis

Null Hypothesis               H₀      y - x > 1,80

Altenative Hypothesis       Hₐ      y - x ≤ 1,80

We have a t(s) = 3,37

We need to compare with t(c)   critical value for

t(c) α; n₁ +n₂-2            df = 12 +11 -2     df  = 21

If we choose  CI = 95 %    then  α = 5 %   α = 0,05

From t-student table

t(c) = 1,72

t(s) = 3,37

t(s) >t(c)

t(s) is in the rejection region therefore we accept Hₐ with CI = 95 %

8 0
3 years ago
Factor the following number and give the steps<br> 4a+12b-20
Reil [10]
Here, we can either factor:
1. The numbers
2. The variables
3. Both 1 and 2
In this instance, we factor 1 because the variables are different but the three numbers have a Greatest Common Factor.
4a+12b-20
4(a+3b-5)
8 0
2 years ago
The cost of setting the type for a pamphlet is $15 and the cost of paper and printing is 25 cents per copy .How much will it cos
kari74 [83]

Answer:

$65

Step-by-step explanation:

It has a fee of $15. If each copy is $.25 each and 200 copies are wanted, multiply them together to get 50. Add 50 and 15 to get 65. It cost $65 for 200 copies.

7 0
3 years ago
-4z+9z 2squared + 2z + 3 combine like terms
earnstyle [38]
7z+2squared+3
That's combined like terms
3 0
3 years ago
Can someone solve this for me quickly!!
LenKa [72]

Answer:

30

Step-by-step explanation:

A right triangle is supposed to equal 90, if you add the other 31 + 29 you will get 60, having 30 as the last side.

5 0
3 years ago
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