Answer:Jason is 5 years old.
John is 4 years old.
Jackson is 12 years old.
Step-by-step explanation:
Let x represent the age of Jason.
Let y represent the age of John.
Let z represent the age of Jackson.
The ages of three siblings Jason John and Jackson totals 21 years. It means that
x + y + z = 21 - - - - - - - - - - -1
Jason is one year older than John. It means that
x = y + 1
Jackson is three times as old as John. It means that
z = 3y
Substituting x = y + 1 and z = 3y into equation 1, it becomes
y + 1 + y + 3y = 21
5y = 21 - 1 = 20
y = 20/5 = 4
x = y + 1 = 4 + 1
x = 5
z = 3y = 3 × 4
z = 12
For this case we have the following expression:
We must indicate the first step that allows to start the simplification of the expression.
It is observed that the first step to follow is to solve the square of the binomial that is in the numerator of the expression.
Answer:
Option A
Answer:
The bush after the two weeks was 14.4 inches tall
Step-by-step explanation:
Let
x ----> bush height after two weeks
we know that
The bush height after two weeks is equal to multiply the height when it was first planted by 1.20
so
Answer:
x = 2
y = -8
Step-by-step explanation:
9x−2y=34 -------------------(I)
5x+2y=−6 -------------------(II)
Add equation (I) & (II) and so y will be eliminated and we could find the value of x.
(I) 9x - 2y = 34
(II) <u>5x + 2y = -6</u> {add}
14x = 28
x = 28/14
x = 2
Plug in x = 2 in equation (I)
9*2 - 2y = 34
18 - 2y = 34
-2y = 34 - 18
-2y = 16
y = 16/-2
y = -8
