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den301095 [7]
3 years ago
14

Write an equivalent expression for 3x + 21

Mathematics
1 answer:
Arada [10]3 years ago
7 0
3(x + 7)
hope this helps
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.y = 2x - 3; x = - 4<br>how do you do this?<br>​
Svetach [21]

y = 2(-4) - 3

y = -8 - 3

y = -11

8 0
4 years ago
I NEED HELP ASAP AND PLEASE GIVE A STEP BY STEP FOR THE EXPLANATION WORTH 15 points
Karolina [17]

Answer:

Step-by-step explanation:

the second one , why? because 7a-12a=-5a

4  - 8 = -4

4 0
3 years ago
7x-2y=16 11x+6y=32.3<br>how to solve this math problem​
Aneli [31]

Answer:

Step-by-step explanation:

These types of equations are called simultaneous equations and the method we can use to solve these type of equations is either Substitution, Elimination and Graphing.

We use substitution here because it is easier.

Equation 1

7x-2y=16

Equation 2

11x+6y=32.3

Lets take equation 1

7x-2y=16\\7x=16+2y\\x=\frac{16+2y}{7}

This is our equation 3 , now put it inside equation 2.

11x+6y=32.3\\11(\frac{16+2y}{7} )+6y=32.3\\\frac{176+22y}{7} +6y=32.3\\\frac{176+22y+42y}{7}=32.3\\176+22y+42y=226.1 \\\\42y+22y=226.1-176\\64y=50.1\\y=\frac{50.1}{64} \\y=0.783\\

We found the value of y , now to find the value of x insert the value of y in equation 3

x=\frac{16+2y}{7}\\x=\frac{16+2(0.783)}{7} \\x=\frac{16+1.566}{7}\\x=\frac{17.566}{7}\\x=2.509

Solved ! See the attached image on both the straight line graphs i have attached for better understanding. Where both the lines intersect each other is our value of (x , y) respectively.

6 0
3 years ago
How do I do number 3
kogti [31]

you simply have to add all of the numbers together, so it'll be 2+5+12+7+1 or 27, therefore the answer is B

5 0
3 years ago
Read 2 more answers
Why is 21 over 30 bigger than 2 over 3?
Nikitich [7]
21/30 simplifies to 2.1/3 so it's a little bit bigger
3 0
4 years ago
Read 2 more answers
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