Let's call the younger student's age A and the older student's age B. The teacher's age will be T.
B = 2A
T = 5B
T+5 = 5(A+5)
Simplify the last equation.
T+5 = 5A+25
T = 5A+20
Now we have two equations solved for T, so we can set them equal to each other.
5B = 5A + 20
We can plug 2A in for B
5(2A) = 5A + 20
10A = 5A + 20
5A = 20
A = 4
To find T, we plug 4 in for A in T = 5A + 20
T = 5(4) + 20
T = 40
The answer is 40 years old.
Answer:
y = 8 degrees
Step-by-step explanation:
128 + 7y - 4 = 180
7y - 4 = 52
7y + 56
y = 8
Answer:
$ 1137.28
Step-by-step explanation:
Answer:
Step-by-step explanation:
7 no
113+12x+7+90+90=360
300+12x=2=360
12x=360-300
x=60/12
x=5
9 no
10x-6+109+79+20x-2=360
30x+180=360
30x=360-180
x=180/30
x=6
Answer:
Jane is not correct.
Step-by-step explanation:
Jane must have complete several examples using positive numbers. That conclusion does not apply for negative numbers.
Let's see an example:
Given the number 5:
- its opposite number is: -5
- the opposite of this opposite number: is 5
Note that is the same number and it is positive.
However, if we check the same situation with a negative number:
Given the number -3:
- its opposite number is: 3
- the opposite of this opposite number: is -3
In conclusion, Jane's conclusion is wrong. The opposite of the opposite number is not always a positive number.
