Find the sum of these four addend

FUNNY MATH: Find the sum of these four addend :)
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Correct Answers: 
5
Points: 
6

What is hidden in the stereogram?

Stereogram - 3D Image
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Correct Answers: 
77
Points: 
1

Calculate the number 1309

NUMBERMANIA: Calculate the number 1309 using numbers [5, 3, 5, 6, 81, 730] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
0
Points: 
10

What a winning combination?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Correct Answers: 
3
Points: 
8

Find the area of the orange figure

Express result to the accuracy of 3 decimal.
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Correct Answers: 
20
Points: 
1
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