Practice Exercises A. solve and check.show your complete solutions1.) x

SOLVING FOR UNKNOWNS

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

1. ) x - 3 = 10

Finding the value of x,

x - 3 = 10

— 3 + 10 = 13

Therefore the value of x is 13,

$\boxed{ \color{green}13 \: - \: 3 \: = \: 10}$

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

2. ) 5x - 8 = 12

Finding the value of x,

5x - 8 = 12

— 8 + 12 = 20

— 20 ÷ 5 = 4

Therefore the value of x is 4,

$\boxed{ \color{green}5(4) \: - \: 8 \: = \: 12}$

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

3. ) x + 6 = 18

Finding the value of x,

x + 6 = 18

— 18 - 6 = 12

Therefore the value of x is 12,

$\boxed{ \color{green}12 \: + \: 6 \: = \: 18}$

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

4. ) 2.5x - 8 = 12

Finding the value of x,

2.5x - 8 = 12

— 8 + 12 = 20

— 20 ÷ 2.5 = 8

Therefore the value of x is 8,

$\boxed{ \color{green}2.5(8) \: - \: 8 \: = 12}$

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

5. ) Jhon can write 50 words in a minute. How long will it takes him to write 450 words?

Given :

50 words

450 words

Formula :

50x = 450

Finding the value of x,

50x = 450

— 450 ÷ 50 = 9

Therefore the value of x is 9

— 90 minutes will takes before Jhon can writes 450 words

$\boxed{ \color{green}50(9) \: = \: 450}$

$\color{green} \underline{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$

knvschl

Answer:

1. 13

2. 4

3. 12

4. Sorry, can't understand the question.

5. 9 minutes

Step-by-step explanation:

1. 10+3= 13

x=13

2. 12+8=20

20/5= 4

x=4

3. 18-6= 12

x=12

4. —

5. 450-50=9

dylanmarco07 ty

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