How many hours is three hours and nine minutes

How many hours is three hours and nine minutes

3+9÷60=3.15

How many hours and minutes is 2.9 hours

9 hours = (2) hours (54) minutes

One hour and nine minutes equals () hours
Want decimals

9÷60=0.15
9 minutes = 0.15 hours
One hour and nine minutes is equal to (1.15) hours

In the algebraic formula: 1 / 2Ab, + 1 / A + B, + AB & # 178; + B + 1, + π + 3,2 / π + 1 / 2, + X & # 178; - x + 1, how many polynomials are there? Why?

In AB & # 178; + B + 1, π + 3, 2 / π + 1 / 2, X & # 178; - x + 1, there are four polynomials, because polynomials are the sum of several monomials

-(- 3) & # 178; × (- 2) & # 179;) / (- 2) & # 179; + | - & # 8531; | how much is it, please write the process, thank you

Solution - (- 3) & # 178; × (- 2) & # 179;) / (- 2) & # 179; + | - & # 8531|
=-9×(-8)÷(-8)+⅓
=-26/3

Four fifths minus 4x is zero point three

4/5 -4x=0.3
0.8-4x=0.3
4x=0.8-0.3
4x=0.5
x=0.5/4
x=0.125

What is 1 / 3 plus 0.75

It's one and one twelfth

The zeros of the function f (x) = log3x + x-3 must be in the interval ()
A. （0，1）B. （1，2）C. （2，3）D. （3，4）

The domain of definition of function is (0, + ∞) derivative function, we can get f '(x) = 1xln3 + 1 > 0, so the function monotonically increases on (0, + ∞) ∵ f (2) = log32 + 2-3 < 0, f (3) = log33 + 3-3 > 0 ∵ the zero point of function f (x) = log3x + x-3 must be in the interval (2, 3), so we choose C

The interval of zero point of function f (x) = log3 (x) - (1 / 3) ^ x

【1,2】

Zero eight x is equal to eleven two uses equation solution

0.8x=11.2
x=11.2/0.8
x=14