Question

Which equation has 5 as the value of k?

Question 6 options:

2.4(k−1.3)=15.12


1.1k−1.8=7.3


1.4(0.7k+2)=2.1


1.8k+3.2=12.2

Answer 1

1.8k + 3.2 = 12.2

Explanation:

Put k = 5 to the each equations and check the equality.

Remember about PEMDAS:

P Parentheses first

E Exponents

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

2.4(k - 1.3) = 15.12

L = 2.4(5 - 1.3) = 2.4(3.7) = 8.88

R = 15.12

L ≠ R NOT

1.1k - 1.8 = 7.3

L = 1.1(5) - 1.8 = 5.5 - 1.8 = 3.7

R = 7.3

L ≠ R NOT

1.4(0.7k + 2) = 2.1

L = 1.4(0.7(5) + 2) = 1.4(3.5 + 2) = 1.4(5.5) = 7.7

R = 2.1

L ≠ R NOT

1.8k + 3.2 = 12.2

L = 1.8(5) + 3.2 = 9 + 3.2 = 12.2

R = 12.2

L = R YES

Answer 2

option 4

Explanation:

option 1:

2.4(k−1.3)=15.12

2.4k - 3.12= 15.12

2.4k = 15.12 +3.12

2.4k=18.24

k=18.24/2.4

k=7.6

option 2:

1.1k−1.8=7.3

1.1k = 7.3+ 1.8

1.1k = 9.1

k= 9.1/1.1

k=8.27

option3:

1.4(0.7k+2)=2.1

0.98k + 2.8 =2.1

0.98k=2.1-2.8

k= -0.71

option 4:

1.8k+3.2=12.2

1.8k=12.2-3.2

1.8k=9

k=9/1.8

k=5