His answer is not correct because when you add fractions, the sum is always greater than 1 1 . His answer is not correct because the sum cannot be less than either addend. His answer is correct because 12 + 1 = 13 12 + 1 = 13 and 15 + 10 = 25 15 + 10 = 25 . His answer is correct because all the fractions are less than 1

b)

Step-by-step explanation:

Here, answers a) and d) are not correct because here we do not have fractions, we have whole numbers.

Also, answer c) is not correct because the result is greater than each number we added.

The conclusion is that answer b) is correct because we add the first two last digits, ten and a unit, and the hundredths.

d is the correct answer

step-by-step explanation:

x= 8 because 3x = 3 * 8, and 3*8 = 24

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it