Answer:
one solution
Step-by-step explanation:
5x - 30 = 3x + 60
2x - 30 = 60
2x = 90
x = 45
A two-digit number is twice the sum of its digit. If the tens digit is 7 less than the unit digit, find the number.
Let x= the unit digit
Then y= the tens digit
<span>And 10y+x= the number
</span>x+y= the sum of the digits
<span>Now we are told that 10y+x=2(x+y) ------1st equation </span>
<span>We are also told that y=x-7 ----------- 2nd Equation </span>
<span>So our equations to solve are: </span>
(1) 10y+x=2(x+y)
<span>(2) y=x-7
</span>
Hope it helps
Answer:
thanks !!
Step-by-step explanation: have a wonderful day :)
3,510
913=117
11730=3,510
3,510
Answer:
What is the circumference of a circle whose radius is 20 feet? Leave answer in terms of π.
A) 10π feet
B) 20π feet
<u>
C) 40π feet </u>
D) 100π feet
Step-by-step explanation:
circumference = 2πr
circumference=2×π×20
circumference=40π
