Answer:-6
Step-by-step explanation:
simple math
Using the trend line, it is found that the year in which the record for the 100-meter dash was 11.8 seconds was:
A. 2005
<h3>What is the regression line?</h3>
It is given by:
In which:
- y is the record in seconds.
- x is the number of years since the year 2000.
The record will be of 11.8 seconds x years after 2000, considering that y = 11.8, hence:
Hence in 2005, and option A is correct.
More can be learned about regression lines at brainly.com/question/26059078
Answer:
This question requires us to change the subject of a formula. This can be achieved by following the order of operations in reverse. First, isolate the terms with our variable of interest, x:
ax - bx = z - y
Then, we take x out as it is being multiplied to both a and b:
x(a - b) = z - y
Dividing (a - b) on both sides, we get:
x = (z - y) / (a - b)
Thus, the answer is x= z-y/a-b
Step-by-step explanation:
Answer:
-32.4
Step-by-step explanation:
-1.2/(-0.4) = 3
-3.6/(-1.2) = 3
-10.8/(-3.6) = 3
Each new terms is the previous term multiplied by 3.
-10.8 * 3 = -32.4
Answer:
L=7cm
W= 26cm
Step-by-step explanation:
Step one
Given data
let the lenght be x
L= x
W= 3x+5
P= 66
Step two:
P=2L+2W
substitute
66= 2x+2(3x+5)
66= 2x+6x+10
66= 8x+10
collect like terms
66-10= 8x
56= 8x
x= 7cm
L= 7cm
W= 3(7)+5
W= 21+5
W= 26cm