39 and 36. both of them rounded to the nearest 10 is 30
1.
is less than 3.5
2.
is more than 2.1
3. -5.3 is more than -5 
4.
is less than 0.8 repeating
The trigonometric ratios show that the angle FHE is 48.59°.
<h3>RIGHT TRIANGLE</h3>
A triangle is classified as a right triangle when it presents one of your angles equal to 90º. The greatest side of a right triangle is called hypotenuse. And, the other two sides are called cathetus or legs.
The math tools applied for finding angles or sides in a right triangle are the trigonometric ratios or the Pythagorean Theorem.
The Pythagorean Theorem says:
. And the main trigonometric ratios are:

It is important to remember that the sum of internal angles for any triangle is 180°.
From the question, it is possible to see 2 right triangles (HGF and FHE).
You can find the hypotenuse of the triangle HGF from the trigonometric ratio: sen Θ

The hypotenuse of triangle HGF is one of legs for the triangle FHE. The, you can find the angle FHE from the trigonometric ratio: tan β. Thus,

Learn more about trigonometric ratios here:
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1. substitute:
4+(7-5)
2. simplify:
4+2
3. evaluate:
6
the answer is 6.
Volume=lwh
So if 7.35 m^3 is the volume, divide it by (4.2x0.5) (50 cm=0.5 m)
7.35/2.1=3.5
So the missing value, or width, is 3.5 meters