What two values can d have if d2 (squared) = 9?

d = 3  &  d = -3

Step-by-step explanation:

the equation to solve is  

Let's remember some properties of numbers and radicals.

Let's take the number 2 for example.

We know  

Also

as well

Since negative TIMES negative also gives us positive.

How do we get the reverse answer? Simple. We square root it. So we would have:

and

-2, since we now know this.

Let's do this process and take square root of our equation to get:

and also d = -3

Hence, two values of d are  d = 3  &  d = -3

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.