9 dived by 3 = 3
so he surfed for 3 hours = 1/3 of 9
and there are 6 hours left
so he spent 6 hours building a sandcastle
Answer:
59.4
Step-by-step explanation:
Answer:
Standard form of the equation is:
∴
Step-by-step explanation:
Given equation:

To convert the given equation to standard form of equation:

Using distribution.


Adding 2 both sides.


Adding
to both sides.

∴
Answer:
There are two possibilities:
and 
and 
Step-by-step explanation:
Mathematically speaking, the statement is equivalent to this 2-variable non-linear system:


First,
is cleared in the first equation:

Now, the variable is substituted in the second one:

And some algebra is done in order to simplify the expression:


Roots are found by means of the General Equation for Second-Order Polynomials:
and 
There are two different values for
:






There are two possibilities:
and 
and 
Daniella must earn a salary of at least $340,000