Answer: -2x
Step-by-step explanation: Very easy maths. Just add 4x + -6x, which is -2x. There's your answer.
Answer:
18
Step-by-step explanation:
A two-digit number (xy) will have the value 10x+y. The sum of its digits is x+y.
You want ...
10x +y = 2(x +y)
1 ≤ x ≤ 9
0 ≤ y ≤ 9
The equation can be simplified to ...
8x = y
The only single-digit values for x and y that satisfy the requirements are ...
x = 1, y = 8
The two-digit number of interest is 18.
_____
Check
Its sum of digits is 1+8 = 9. 2×9 = 18.
_____
Comment on the relationship in the problem
Many of us learned our multiplication tables for 9s by remembering that the sum of digits of 9n was 9, and that the leading digit of the product was n-1.
Answer:
the statement is x=y/8 the number is 18
Step-by-step explanation:
ur welcome.
Answer:
240
Step-by-step explanation:
you have to divide 1,920 by 8
Answer: B. 4,000
Step-by-step explanation:
Given: The initial amount of bacteria in the dish A= 500
Since, The amount of bacteria in the dish doubles every 3 hours.
The multiplicative rate of change after every 3 hours = 2
Time period = 3 hours
By exponential function, we have the amount of bacteria after time period 'x' is given by :-
, where A is the initial amount , b is the multiplicative rate of change in time period x.
Number of 3 hours period in 9 hours = 3
Therefore, x=3
Therefore, the amount of bacteria in the dish after 9 hours is given by :_
X+Y=6
X-Y=10
Step-by-step explanation:
x + y = 6 ...................equation 1
x - y = 10 ..................equation 2
Solving equation 1 and 2
x + y = 6
x -y =10
2x = 16
x = 16 /2
Therefore x = 8
Now
putting x = 8 in equation 1
8 + y = 6
y = 6 -8
y = -2
hope it was helpful :)
Answer:
x=8 and y= -2
Step-by-step explanation:
x+y=6
x-y=10 + ( add them together)
-----------------
2x=16 ( substitute/ plug x back in )
x=8
8+y=6
8-y=10
y=-2