What is the most efficient first step to isolate the variable term on one side of this equation? -9x = -4x + 5 a. subtract 5 from both sides. b. add 5 to both sides. c. subtract 9x from both sides. d. add 4x to both sides.

D. Add 4x to both sides gets all of x on one side with the solution on the other side.

The most efficient 1st step to solve this equation is to add 4x to both sides of equation, then you get

This equation you can solve by dividing the whole equation by (-5):

option D.

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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answer is 12345678900987654321234567890987654321

step-by-step explanation: