How many hours is 36 minutes fast How many hours is 36 minutes and 30 seconds

How many hours is 36 minutes fast How many hours is 36 minutes and 30 seconds

36 minutes equals 0.6 hours
36 minutes and 30 seconds is equal to (36 * 60 + 36) / 3600

100÷（-2）²-（-2）÷〔-2/3〕＝?

100/4-2*3/2=25-3=22

If a & # 178; = 4, and | a | = – a, a is equal to what

When a = - 2, a & #178; = 4, and|a| = – a

Y = 2 (x – 3) & #178; – 5 what is the end of the simplification

y=2x²-6x+13

Solve the equation with proper method: 3 (x – 2) &# 178; – x (x – 2) = 0

3（x–2）²–x（x–2）=0
（x-2）[3(x-2)-x]=0
(x-2)(2x-6)=0
x1=2 x2=3

1²+3²+5²+…… （2n–1）²=?

Each item is expanded as 4N ^ 2-4n + 1, so the sum is:
4(1^2+2^2+...+n^2)-4(1+2+...+n)+n
= 4n(n+1)(2n+1)/6-4n(n+1)/2+n
= (4n^3-n)/3
Note: n ^ 2 is n square, n ^ 3 is n cube

Calculation (2 & ~ 178; + 4 & ~ 178; + 6 & ~ 178; +... + 50 & ~ 178;) - (1 & ~ 178; + 3 & ~ 178; + 5 & ~ 178; +... + 49 & ~ 178;)

（2²+4²+6²+...+50²）-（1²+3²+5²+...+49²）=2²-1²+4²-3²+6²-5²+...+50²-49²=（2+1）（2-1）+（4+3）（4-3）+（6+5）（6-5）+......

What is the sum of (- 1) + (- 1) & 178; + (- 1) & 179; +. + (- 1) to the power of 101

The original formula = - 1 + 1-1 + 1. + 1-1
=-1.

In △ ABC, if Sin & # 178; B + Sin & # 178; C / Sin & # 178; a = 1, then a is equal to?
+w+

Let a, B and C be opposite to each other
（sin^2B+sin^2C）/sin^2A=(b^2+c^2)/a^2=1
So B ^ 2 + C ^ 2 = a ^ 2
So ABC is a right triangle, a is a hypotenuse, so a = 90 degree

What is the equivalent of Sin & # 178; 1 ° + Sin & # 178; 2 ° + Sin & # 178; 3 ° +... + Sin & # 178; 90?
To analyze

sin²1°+sin²2°+sin²3°+...+sin²90°
=(sin²1º+sin²89º)+(sin²2º+sin²88º)+.+(sinº44º+sin²46º)+sin²45º+sin²90º
=(sin²1º+cos²1º)+(sin²2º+cos²2º)+.+(sinº44º+cos²44º)+sin²45º+sin²90º
=(1+1+.+1) +1/2+1
=45+1/2
=91/2