Is this right and i need getting the decimal estimate

The answer of 12 to 13 is almost correct - you only forgot the - signs

As for the decimal estimate, take the square root of 12 (144) and the square root of 13(169) and because 150 is closer to 144 than 169 we can guess that the decimal is about -12.2

there are no figures how am i supposed to answer this question

step-by-step explanation:

if i put something wrong your not gonna like it so rather not say nothing.