Question

Solve the equation. Round the answer to the nearest tenth.

2.8x = 5.1


A.1.7


B.1.8


C.1.9


D.18.2



2) 1.26x + 2.16 = 7.71



A.4.3

B.9.6

C.4.5

D.4.4


3) Which is the best estimate of x based on rounding the constants and coefficients in the equation to the nearest integer?


5.2x + 3.2 = 9.8



A.1.1

B.1.2

C.1.4

D.1.5



4) Which is the best estimate of x based on rounding the constants and coefficients in the equation to the nearest integer?


4.12(x – 7.89) = 18.12




A.12.4

B.12.5

C.12.2

D.12.6

Answer 1

Hello,

1) Answer B
2.8x=5.1
==>x=51/28
==>x=1.821428...
==>x≈1.8

2) Answer D
1.26x+2.16=7.71
==>x=(7.71-2.16)/1.26
==>x=4.404761904...
==>x≈4.4

3) Answer C
5x+3=10
==>x=7/5
==>>1.4

4) Answer B

4(x-8)=18
==>4x=18+32
==>x=12.5

Answer 2

1.) 2.8x = 5.1
x = 5.1 / 2.8
x = 1.82 ----> B

2.) 1.26x + 2.16 = 7.71
1.26x = 7.71 - 2.16
x = 5.55 /1.26
x = 4.40 -----> D

3.) 5.2x + 3.2 = 9.8
5.2x = 9.8 - 3.2
x =6.6/5.2
x=1.27 -----> B

4.) 4.12(x – 7.89) = 18.12
4.12x – 32.51 = 18.12
4.12x = 18.12 + 32.51
x = 12.29 -----> C