Thread: Easy Stuff?

I hope this is easy for you guys, because it is most certainly not for me...

1) Brandon Filop had seven times as many pennis as Billy Wang. When Brandon gave Billy 9 pennies, he still had 36 more pennies than Billy. How many pennies did Brandon have originally?

2)The number of digits in the number is:
a)3885
b)1992
c)1993
d)1994
e)1995

3)The express is equivalent to
a)
b)
c)
d)
e)

4) If , then d=
a) 6
b) 4
c) 2
d) -2
e) -3

5) A rectangular tank contains water to a depth of 11 cm. The base of the tank measures 5 cm by 7 cm. If all the water in the bank is poured into an empty cylindrical tank of base radius 5 cm and there is no water overflow, find the depth of water in the cylindrical tank.

Thanks for helping me guys!

1) Let F denote Brandon Filop's pennies and W denote Billy Wang's pennies.
...[1]
...[2]
By subtraction we have




So


2) The number of digits of a number N is

So the number of digits in is

Then get out a calculator and that's 1993 digits.

3)

4)









5) The rectangular tank contains of water.

The volume of the cylindrical tank is where h is the height.

Then we substitute in 385:

Hehe thanks!! But I just have a few more questions

1) has the same value as
a)
b)
c)
d)

2) If , then equals

Just two more Hope you could help me man.

Originally Posted by Rocher

Hehe thanks!! But I just have a few more questions

1) has the same value as
a)
b)
c)
d)

You can do this by hand with a little inspiration, but you can do this very easily with a calculator.







-Dan

Originally Posted by Rocher

2) If , then equals

The simplest idea here is to solve for x and plug x into your expression:











So


-Dan