According to the number line, which statement must be true? a) a < 0 b) b > 10 c) c < 15 d) d > 15

The right answer is option d.

Step-by-step explanation:

As you know, in the number line we are looking at the roots of the numbers, and as you know; (√A)^2 = A, so using this, we can analyze each option:

a) A can not be less than zero, because √A is bigger than zero.

b) we can see that √B is smaller than 3, and 3^2 = 9, so B must be smaller than 9, and then, smaller than 10.

c) We can see that √C is almost equal to 4, and 4^2 = 16, so most likely, C is bigger than 15, so this is discarded.

d) we can see that √D is bigger than 4, and using the same reasoning as before, we can see that D is bigger than 16, and 16 is bigger than 15, so D > 15 is correct.

answer: 2530

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