There are many strategies that can be used it really depends on what kind of questions you're answering.
Answer:
y=3
Step-by-step explanation:
you times 2 and 2 together and it give you 4
Answer:
Perimeter is 17.07
Step-by-step explanation:
We know that DF = EF = 5 cm, since D and E are the midpoints of AC and AB, both of which are 10 cm in length.
We need to use the Pythagorean theorem to get the length of DE.

So the perimeter of DEF is 5 + 5 + 7.07 = 17.07
Oh the answer is a I looked it up this time
0.4 is four tenths. 0.4 = 4/10=2/5