Adult lizards of a certain breed weigh an average of 5.2 times what they weigh at birth. which represents the weight of an adult lizard, w, that weighed b grams at birth? a: w = 5.2/b b: b/5.2 c: 5.2 + b d: w = 5.2 * b

 Option 'D' is correct.

Step-by-step explanation:

Since we have given that

Number of grams the adult lizard weighed at birth be 'w'.

According to question, Adult lizards weigh an average of 5.2 times what they weight at birth.

As for 'times ' we will use multiplication operation :

So, it becomes

Hence, Option 'D' is correct.

2 works

-3 is extraneous

Step-by-step explanation:

sqrt(x + 7) - 1 = x                      Add 1 to both sides

sqrt(x + 7) = x + 1                     Square both sides

(x + 7) = (x + 1 )^2

x + 7 = x^2 + 2x + 1                Subtract x from both sides

0 = x^2 + x + 1 -7                    

0 = x^2 + x - 6                        This will factor

(x + 3)(x - 2)  = 0                      Find the values for x

x + 3 = 0

x = - 3

x - 2 = 0

x = 2

Now you must check this to see if both values work

sqrt(-3 + 7)  - 1 = -3

sqrt(4) - 1 = -3

2 - 1 =? - 3

1 does not equal - 3. Therefore - 3 is extraneous. Try x = 2

sqrt(2 + 7) - 1 = 2

sqrt(9) - 1 = 2

3 - 1 = 2

2 = 2