623 is close to 650 so you round that up to 650 and 0.67 is rounded to 0.65
650 x 0.65 = 422.5
Round 422.5 = 420
Your welcome :)
Answer: a = 8
Step-by-step explanation:
Volume of a square based pyramid is given as
.
where a is the length of the side and h is the height.
Substituting into the formula , we have
V = 
128 =
/3
384=
X 6
Divide through by 6
384/6 = 
64 = 
Therefore :
a = 
a = 8
Answer:

Step-by-step explanation:
Using the Pythagorean identity
sin²x + cos²x = 1, then
sinx = 
Note that (
)² = 
sinΘ = 
=
= 
Answer:
The younger brother is 16 years old.
Step-by-step explanation:
The younger brother is aged x.
It follows that the older brother is aged x+3.
x + (x+3) = 35
2x + 3 = 35
2x = 32
x = 16
Answer:
The correct options are A and B.
Step-by-step explanation:
The angles are represented by three capital letters like: ABC or DEF. In these names middle letter represent the vertex of the angle.
The order or first and last letter does effect the angle. It means

We have to find the angle with a vertex at Y. It means the middle letter must be Y.
In option A and B the middle letter is Y, therefore both options are correct.
In option C and D the middle letter is not Y, therefore both options are incorrect.