Answer:
4.80 units (3 s.f.)
Step-by-step explanation:

Hence, length of AB
= √(11+1)^2 - (8+3)^2
= √ 12^2 -11^2
= √ 23
= 4.80 units (3 s.f.)
If you put brackets around (2+1), your method of working is:
1) 15-4*(2+1)=3
2) 15-4*3=3
3) 15-12=3
You don't need any more brackets, as the BIDMAS (brackets, Indices, division, multiplication, addition, subtraction) rule does the rest of the job for you.
The answer is therefore: 15-4*(2+1)=3
Answer:

Step-by-step explanation:
45 - 45 - 90 Triangles
When one leg = x, the hypotenuse = x
So, if the hypotenuse is 1, then divide by
to get the leg.
rationalize denominator.
×
=
=
=
4√6÷√30= 4√5/5, or ≈1.788854382