Answer:
See the explanations below
Step-by-step explanation:
Given the function y = x²+12x
We are to find the inverse and identify the error in the calculation:
Step 1: Replace y with x
x = y²+12y
First Error: There is an error here y, the variable attached to x should be y and not x that is y = y²+12y and not y = y²+12x. The x should be totally replaced with
The second error is where he wrote y = √-11x
The square root of a value must return both negative and positive value not only the positive value. Hence the correct expression should have been y = ±√-11x (Note that the sign ± was introduced)
Third error: Since the value inside the square rot is a negative value hence the value of x must be negative i.e x must be less than zero not greater then. The correct inequality expression should have been <u>x <0</u> and not
x< 0
Her rate of speed is 2 miles per hour.
Step-by-step explanation:
Given,
In hours she walks miles.
To find the rate of speed.
We need to find out the speed in 1 hour.
We will apply <em>unitary method</em>.
In hours she walks miles.
In 1 hour she walks ÷ miles.
= × miles
= 2 miles
Hence,
Her rate of speed is 2 miles per hour.
Answer:
17 and 36
Step-by-step explanation:
x + y = 53
y = 2x + 2
x + 2x +2 = 53
3x = 51
x = 17
so y = 2 x 17 + 2 = 36