Test prep
steel is a mixture of iron, carbon, and other elements. the table shows the
number of parts of each element in two different-sized samples of steel.
other elements
iron
carbon
7
90
sample # 1
sample # 2
3.5
45
1.5
a. what is the unit rate of parts iron to parts carbon?
pic
- 30
b. what is the unit rate of parts iron to parts all other elements, including
carbon?

37/3

step-by-step explanation:

step 1: simplify both sides of the equation.

7x+8(x+

1

4

)=3(6x−9)−8

7x+(8)(x)+(8)(

1

4

)=(3)(6x)+(3)(−9)+−8(distribute)

7x+8x+2=18x+−27+−8

(7x+8x)+(2)=(18x)+(−27+−8)(combine like terms)

15x+2=18x+−35

15x+2=18x−35

tep 2: subtract 18x from both sides.

15x+2−18x=18x−35−18x

−3x+2=−35

step 3: subtract 2 from both sides.

−3x+2−2=−35−2

−3x=−37

step 4: divide both sides by -3.

−3x

−3

=

−37

−3

x=

37

3

i dont know

step-by-step explanation:

ljn

step-by-step explanation: