Answer:
x = 7
Step by step explanation:
<em>minus</em><em> </em><em>x</em><em> </em><em>on</em><em> </em><em>both</em><em> </em><em>sides</em>
6 = x -1
<em>add</em><em> </em><em>1</em><em> </em><em>on</em><em> </em><em>both</em><em> </em><em>sides</em>
<em>x</em><em> </em><em>=</em><em> </em><em>7</em>
If the original number is ab it has a value of
10a+b when it is reversed it will have a value of 10b-a
10b+a-10a-b is the differences which is equal to
9b-9a
So the numbers must be divisible by 9
12) Im not sure about this one
13) c
14)a
Answer:
The questions asks you to write a number in which the digit "5" is one-tenth the value of the number 5 in 89.547. You are looking for a number that is one-tenth of 0.5. Remember, one-tenth equals 1/10 which equals 0.1. One-tenth of 0.5 equals 0.1 multiplied by 0.5 which equals 0.05.
The numbers represent an arithmetic progression.
The difference between terms is d=7.
S=a1+a2+...+an, a1=3 and
an=a1+(n-1)×d=3+17×7=122
S=(a1+an)n/2=(3+122)×18/2=125×9=1125