Percent error=(experimentally determined boiling point-actual boiling point)

=(124.1 - 125.7) = 1.6 °C

Quantity Number of significant figures

0.070020 meter 5

10,800 meters 5

0.010 square meter 2

5.00 cubic meters 1

507 thumbtacks 3

(5.3 x 10⁴) + (1.3 x 10⁴) =6.6 x 10⁴

(7.2 x 10⁻⁴) ÷ (1.8 x 10³)=4 x 10⁻⁷

10⁴ x 10⁻³ x 10⁶=10⁷

(9.12 x 10⁻¹) - (4.7 x 10⁻²)=(9.12 x 10⁻²) - (4.7 x 10⁻²)

=(91.2-4.7) x 10⁻²

=85.5 x 10⁻²

1.B

2.C

3.D

4.C

5.C

6.D

That is the answers to the question that you asked and I hope that it helps you with the test.

2.C

3.D

4.C

5.C

6.D

That is the answers to the question that you asked and I hope that it helps you with the test.

1) the solution to the inequality

10x + 18 < −2 is A. x<−2

proof: 10x + 18 < −2 and 10x < −2 -18=-20 so 10x<-20 implies x< -20/10=-2

2) the solution to the inequality

−6x + 5 > −1 is B. x<1

proof: −6x + 5 > −1 -6x>-1-5= -6, - 6x> -6 implies x< -6/-6=1

3) let's solve −4.2y + 2.1 > −2.52

if −4.2y + 2.1 > −2.52 so −4.2y > −2.52 - 2.1= - 4.62

−4.2y > - 4.62 implies y< - 4.62 / - 4.2=1.1

so y<1.1

4) let's solve −4/3x + 1/6 < 7/9

if −4/3x + 1/6 < 7/9 then −4/3x < 7/9 -1/6=7/9 -1/6 (multiplied by 3 for each member) we have −4x < 7/3 -1/2=(2x7-1x3)/2x3=11/6, it means −4x < 11/6

and then x>11/-24, x> -11/24

the solution set of

−9.5x−1.5>−30 can be found by solving this inequation,

−9.5x>−30 +1.5 −9.5x> -28.5 so it means x< 28.5/9.5=3

x<3, the solution set is S= ] -infinity, 3[

10x + 18 < −2 is A. x<−2

proof: 10x + 18 < −2 and 10x < −2 -18=-20 so 10x<-20 implies x< -20/10=-2

2) the solution to the inequality

−6x + 5 > −1 is B. x<1

proof: −6x + 5 > −1 -6x>-1-5= -6, - 6x> -6 implies x< -6/-6=1

3) let's solve −4.2y + 2.1 > −2.52

if −4.2y + 2.1 > −2.52 so −4.2y > −2.52 - 2.1= - 4.62

−4.2y > - 4.62 implies y< - 4.62 / - 4.2=1.1

so y<1.1

4) let's solve −4/3x + 1/6 < 7/9

if −4/3x + 1/6 < 7/9 then −4/3x < 7/9 -1/6=7/9 -1/6 (multiplied by 3 for each member) we have −4x < 7/3 -1/2=(2x7-1x3)/2x3=11/6, it means −4x < 11/6

and then x>11/-24, x> -11/24

the solution set of

−9.5x−1.5>−30 can be found by solving this inequation,

−9.5x>−30 +1.5 −9.5x> -28.5 so it means x< 28.5/9.5=3

x<3, the solution set is S= ] -infinity, 3[

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