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timurjin [86]
2 years ago
13

What is the value of 9a- 3 if a= 2 PLEASE ANSWER FAST 15 POINTS

Mathematics
2 answers:
nirvana33 [79]2 years ago
4 0
Answer
9 (2) -3
18-3 = 15
matrenka [14]2 years ago
3 0

Answer:

15

Step-by-step explanation:

If a=2 that means 9(2)-3

Do multiplication first

9x2=18

Then subtract 3

18-3=15

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What is the first step in solving this system of equations by elimination? 5a + 3b = –9 2a – 5b = –16
Elis [28]
<span>Multiply one of the equations so that both equations share a common complementary coefficient.
       In order to solve using the elimination method, you need to have a matching coefficient that will cancel out a variable when you add the equations together. For the 2 equations given, you have a huge number of choices. I'll just mention a few of them.
   You can multiply the 1st equation by -2/5 to allow cancelling the a term.
   You can multiply the 1st equation by 5/3 to allow cancelling the b term.
   You can multiply the 2nd equation by -2.5 to allow cancelling the a term. You can multiply the 2nd equation by 3/5 to allow cancelling the b term.
   You can even multiply both equations.
For instance, multiply the 1st equation by 5 and the second by 3. And in fact, let's do that. 5a + 3b = –9 2a – 5b = –16 5*(5a + 3b = -9) = 25a + 15b = -45
   3*(2a - 5b = -16) = 6a - 15b = -48
       Then add the equations 25a + 15b = -45
   6a - 15b = -48
   =
   31a = -93
   a = -3
       And then plug in the discovered value of a into one of the original equations and solve for b.</span>
5 0
3 years ago
What is the order of this matrix?
myrzilka [38]

Answer:

I do

Step-by-step explanation:

not know

7 0
3 years ago
Choose the expression that represents the prime factorization of 96.
fredd [130]

Answer:

3.2.2.2.2...

Step-by-step explanation:

The prime factors of 96 are written as 2 x 2 x 2 x 2 x 2 x 3 or 3 x 25, where 2 and 3 are the prime numbers

4 0
2 years ago
Im having trouble finding facts that are in scientific notation. a good example is: a microbe is 1.23*10^-3 small. (this is not
Afina-wow [57]
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mass of proton: 1.673 times 10-27
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just google chem constants sheet
4 0
3 years ago
Read 2 more answers
What is the area of this trapezoid?
Sonbull [250]
Find the area of the square first
Area = Length x Width
Area = 12 x 9
Area = 108

Find the area of the right triangles
Area = 1/2(Length x Base)
Area = 1/2(9 x 2)
Area = 1/2(18)
Area = 9
Since there is 2 triangles multiply by 2
9 x 2 = 18

Now add
108 + 18 = 126
126 is your area
8 0
2 years ago
Read 2 more answers
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