The answer is -12
because you just have to simplyfy it and plug in the values
Question:
Lisa walks at an average speed of 6 km/h for 15 hours.
Dan completes the same distance in an hour. Calculate Dan's average speed.
Answer:
Step-by-step explanation:
Given
Lisa:


First, we calculate the distance covered by Lisa:



So, Dan distance can be represented as:
--- Dan completes the same distance as Lisa
-- Time to complete the distance
Dan's average speed is:



<em>Hence, Dan's average speed is 90km/hr</em>
Answer:
The solution for given system of equations is: x = 6 and y = 3
Or
(6,3)
Step-by-step explanation:
Given equations are:

There are three methods to solve simultaneous equations
- Elimination
- Substitution
- Co-efficient method
We will use the elimination method as the coefficients of x in both equations are already same
Subtracting equation 2 from equation 1

Putting y = 3 in equation 2

Hence,
The solution for given system of equations is: x = 6 and y = 3
Or
(6,3)
Solution:
16.
Given: 3n+5/7
We can rewrite it as:
3n+5/7 = 3n/7 + 5/7
The sum of two terms is 3n/7 + 5/7.
17.
Given: 9p-6/3
We can rewrite it as:
9p-6/3 = 9p/3 - 6/3
= 3p - 2
The difference of two terms is 3n/7 + 5/7.
18.
Given: Length = -2n+17
Width = 24
Area = length * Width
= (-2n + 17) * 24
= -48n + 408
Hence, the simplest form is -48n + 408.