Question

1) Is -7+9=-9+7 true, false, or open? (1 point)

a) true
b) false
c)open

2) Is 4x-3-19 true,false, or open? (1 point)
a) true
b) false
c)open

3) Which of the following is a solution to the equation 16=4x-4
a) -5
b)-4
c)5<-- (this is the answer for this one)
d)16

4) An art student wants to make a model of the classroom. The length of the classroom is 2.4 time its 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

Please help!!

Answer 1

1. b ) FALSE

2. c ) OPEN

3. c) 5

4. a ) 17.5 in

Explanation:

1.

Is -7+9=-9+7 true, false, or open?

Left Hand Side = -7+9 = 2

Right Hand Side = -9 + 7 = -2

∴ Left Hand Side ≠ Right Hand Side

Hence , it is FALSE.

2.

Is 4x-3-19 true,false, or open?

Open sentence is when there is a variable in the problem or equation.

4x-3-19 it consist of variable,

Hence ,it is OPEN.

3.

Solution to 16 = 4x -4

Add 4 on Both the side then we will have

20=4x

Divide both the side by 4

x =5

Hence , c) 5 is the required Solution to the equation 16 = 4x -4.

5.

let length and width of the classroom be 'L' and 'W'.

According to the given condition,

L=2.4×W

Substituting length, L = 42 inches we get

`42 =2.4* W\\\\W=(42)/(2.4)=17.5\ in`

Hence Width of the model is a) 17.5 in.