Answer:
Number is 61 or 16
Step-by-step explanation:
Let x be the digit at tens place and y be the digit at ones place.
So, the two digit number is 10x+y.
When the digits are reversed, number becomes 10y+x
According to question, the sum of a 2-digit number and the 2-digit number when the digits are reversed is 77
10x+y+10y+x=77
11x+11y=77
x+y=7 (i)
Also, difference of the same two numbers is 45
(10x+y)-(10y+x)=45 or (10y+x)-(10x+y)=45
x-y=5 (ii) or y-x=5 (iii)
Consider equations (i) and (ii)
Put x=y+5 in x+y=7
y+5+y=7
2y=2
y=1
So, x=y+5=1+5=6
So, number = 10x+y=10(6)+1=61
Consider equations (ii) and (iii)
Put y=x+5 in x+y=7
x+5+x=7
2x=2
x=1
So, y=x+5=1+5=6
So, number = 10(1)=6=16
Therefore, number is 61 or 16
Answer:
it will be 90 i hope it weark
Step-by-step explanation:
SA=4pir^2
78.54km^2=SA
78.54=4pir^2
divide both sides by 4
19.635=pir^2
aprox pi=3.14 so divide both sides by 3.14
6.25318=r^2
sqrt both sides
2.50063=r
round
radius=2.5km
this question is flawed in that it gives the wrong units
answer is the option with 2.5 in it
2nd one
As the intervals moves from left to right on the graph, the average rate of change increases
<h3>How to determine the change in the rate of change?</h3>
The function is an exponential growth function.
This is known because it has an initial value at (0, 2), and the value increases to the right
The average rate of change of exponential growth functions increases towards the right.
This means that:
The initial statement is "as the intervals moves from left to right on the graph, the average rate of change increases
Because the average rate of change keeps changing, the final statement is:
Since the average rate of change is also changing, the function is changing and approaches infinity
Read more about exponential growth function at
brainly.com/question/11487261
#SPJ1
Answer:
5x5=25 thanks for the points