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denis-greek [22]
3 years ago
15

How do you solve two step equations like 2x+1=9

Mathematics
2 answers:
IrinaVladis [17]3 years ago
7 0
2x+1=9
subtract 1 from both sides
2x=8
divide by 2 on both sided
x=4
Gnesinka [82]3 years ago
4 0
2x + 1 = 9
      - 1 = -1
     ^the 1's cancel
       2x = 8
         x = 8/2
         x = 4 <--- that is the answer

hope this helps :)


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How many 2-digit numbers are multiples of 2 but not 3?
WARRIOR [948]

Answer:

30 numbers

Step-by-step explanation:

Two-digit numbers divisible by 2 are basically just the even two-digit numbers: 10, 12, 14,...96, 98.

Let's collectively divide all these numbers by 2:

10/2 , 12/2 , 14/2 , ... 96/2 , 98/2

5, 6, 7, ... 48, 49

Now subtract 4 from each of them:

5 - 4, 6 - 4, 7 - 4, ... , 48 - 4, 49 - 4

1, 2, 3, ... , 44, 45

So there are 45 multiples of 2 that are two-digit numbers.

The numbers that are both multiples of 2 and 3 are those that are multiples of 6:

12, 18, 24, ... , 96

We want to count how many there are, so divide all these numbers by 6:

12/6 , 18/6 , 24/6 , .... , 96/6

2, 3, 4, .... , 16

There are 15 numbers that are multiples of 2 and 3, so subtract 15 from 45: 45 - 15 = 30

The answer is 30.

Hope this helps!

7 0
4 years ago
Find all relative extrema of the function. Use the Second Derivative Test where applicable. (If an answer does not exist, enter
Lapatulllka [165]

Answer:

Relative minimum: \left(-\frac{5}{2}, -\frac{33}{4}\right), Relative maximum: DNE

Step-by-step explanation:

First, we obtain the First and Second Derivatives of the polynomic function:

First Derivative

f'(x) = 2\cdot x + 5 (1)

Second Derivative

f''(x) = 2 (2)

Now, we proceed with the First Derivative Test on (1):

2\cdot x + 5 = 0

x = -\frac{5}{2}

The critical point is -\frac{5}{2}.

As the second derivative is a constant function, we know that critical point leads to a minimum by Second Derivative Test, since f\left(-\frac{5}{2}\right) > 0.

Lastly, we find the remaining component associated with the critical point by direct evaluation of the function:

f\left(-\frac{5}{2} \right) = \left(-\frac{5}{2} \right)^{2} + 5\cdot \left(-\frac{5}{2} \right) - 2

f\left(-\frac{5}{2} \right) = -\frac{33}{4}

There are relative maxima.

6 0
3 years ago
The time spent on social media and the amount of time spent doing homework. * is there a positive, negative, or no correlation?
serious [3.7K]

Answer:

negative correlation.

Step-by-step explanation:

Spending more time on social media means that you'll spend less time on homework.

5 0
3 years ago
Solve x=y+10 ans x=2y+3 by substitution
Nesterboy [21]
X = y + 10
x = 2y + 3

sub 1 x in for the other
y + 10 = 2y + 3
10 - 3 = 2y - y
7 = y

x = y + 10
x = 7 + 10
x = 17

ur solution is (17,7)
5 0
3 years ago
The coldest temperature one day was -10°F. during the day the temperature climbed 16°. what was the higher temperature?
Tom [10]

If it was -10 degrees outside and it went up 16 degrees then it would be 5 degrees outside

4 0
3 years ago
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