Is -7+9=-9+7 true, false, or open?
A. True
B. False**
C. Open
Is 4x-3=19 true, false, or open
A. True
B. False
C. Open**
Which of the following is a solution to the equation 16=4x-4
A. -5
B. -4
C. 5**
D. 16
An art student wants to make a model of the classroom. The length of the classroom is 2.4 times it width. The length of the student’s model is 42 in. What should the width of the model be?
A. 17.5 in**
B. 20.5 in
C. 83.6 in
D. 100.8 in
I meant one more
The answer for the final question is x=72
all correct.
good work
They are all still correct to this day but there are 2 more questions left
The first question asks if -7+9 is equal to -9+7. To solve this, you can simply calculate both sides of the equation:
-7 + 9 = 2
-9 + 7 = -2
Since 2 is not equal to -2, the statement is false. Therefore, the correct answer is B. False.
The second question asks if 4x-3=19 is true, false, or open. To find out, we need to solve the equation for x.
Add 3 to both sides of the equation:
4x - 3 + 3 = 19 + 3
4x = 22
Divide both sides of the equation by 4:
4x / 4 = 22 / 4
x = 5.5
Since we can find a specific value for x, the statement is not open. Therefore, the correct answer is C. False.
The third question asks which of the given options is a solution to the equation 16 = 4x - 4. To find the solution, we can solve the equation:
Add 4 to both sides of the equation:
16 + 4 = 4x - 4 + 4
20 = 4x
Divide both sides of the equation by 4:
20 / 4 = 4x / 4
5 = x
Therefore, the solution to the equation is x = 5. Since option C, 5, matches the solution, the correct answer is C. 5.
The fourth question asks for the width of an art student's model of a classroom. We are given that the length of the classroom is 2.4 times its width, and the length of the student's model is 42 inches.
Let's assume the width of the classroom is W. According to the information given, the length of the classroom is 2.4 times the width, so the length would be 2.4W.
We are also given that the length of the student's model is 42 inches. We can set up an equation based on this information:
2.4W = 42
To find the width of the model, we need to isolate W. Divide both sides of the equation by 2.4:
(2.4W) / 2.4 = 42 / 2.4
W = 17.5
Therefore, the width of the model should be 17.5 inches. The correct answer is A. 17.5 in.