- #1
Aya
- 46
- 0
Please help I have ALOT of questions!
1.)Starting at 888 and counting backward by 7, a student counts 888, 881 and 874, and so on. Which of the following numbers will be included?
a) 35 b) 34 c) 33 d) 32 e) 31
Ok, so I by using the calcuator the aswer is 34, but how would you calcuate this using an equation or something more sensible...
I think I have to use this one
tn=a + (n-1) d
a= 888
n=
d= -7
tn=
... now what
_____________________________________________________________
2. the sum of the first n even postive integers is h. the sum of the first n odd positive integers is k. then h -k is equal to:
a) n/2
b) n/2 -1
c) n
d) -n
e) n - 1
so... nK and nh
I don't get it...
____________________________________________________________
3. the largest four- digit number to be foung in the arithmetic sequence
1,6,11,16,21, ... is
t1= 1
t2= 6
t3= 11
t4= 21
9996?
because it goes form 1 to 6 the (last number)
2nd last number stayes for 2 ed 1,1,2,2
everything else up one
but is there an equation for this or something?
___________________________________________________________
4. the sum of 50 consecutive intergers is 3250. tha largest of these intergers is
a)64
b)66
c)112
d)114
e)115
I don't know how to so this...is it the same as before?
___________________________________________________________
5 Jan 1, 1986 was a wed. Jan 1 1992 was waht day of the week?
86 wed
87 thurs
88 fri
89 sat
90 sun
91 mon
92 tues
tuesday?
what would an equatin be
___________________________________________________________
the total number of digets used to number all the pages of a book was 216. Find the number of pages in the book.
tn= a + (n-1) d
216= 1 + (n- 1) 1
216= 1 + n - 1
216=n
is that wrong...
so...
total number of digits? sum?
Sn= n/2 [ 2a + ( n-1) d ]
216= n/2 [ 2(1) + (1-1) 1]
216= n/2 (2)
216= n
umm...?
Pleas help!
thanks
1.)Starting at 888 and counting backward by 7, a student counts 888, 881 and 874, and so on. Which of the following numbers will be included?
a) 35 b) 34 c) 33 d) 32 e) 31
Ok, so I by using the calcuator the aswer is 34, but how would you calcuate this using an equation or something more sensible...
I think I have to use this one
tn=a + (n-1) d
a= 888
n=
d= -7
tn=
... now what
_____________________________________________________________
2. the sum of the first n even postive integers is h. the sum of the first n odd positive integers is k. then h -k is equal to:
a) n/2
b) n/2 -1
c) n
d) -n
e) n - 1
so... nK and nh
I don't get it...
____________________________________________________________
3. the largest four- digit number to be foung in the arithmetic sequence
1,6,11,16,21, ... is
t1= 1
t2= 6
t3= 11
t4= 21
9996?
because it goes form 1 to 6 the (last number)
2nd last number stayes for 2 ed 1,1,2,2
everything else up one
but is there an equation for this or something?
___________________________________________________________
4. the sum of 50 consecutive intergers is 3250. tha largest of these intergers is
a)64
b)66
c)112
d)114
e)115
I don't know how to so this...is it the same as before?
___________________________________________________________
5 Jan 1, 1986 was a wed. Jan 1 1992 was waht day of the week?
86 wed
87 thurs
88 fri
89 sat
90 sun
91 mon
92 tues
tuesday?
what would an equatin be
___________________________________________________________
the total number of digets used to number all the pages of a book was 216. Find the number of pages in the book.
tn= a + (n-1) d
216= 1 + (n- 1) 1
216= 1 + n - 1
216=n
is that wrong...
so...
total number of digits? sum?
Sn= n/2 [ 2a + ( n-1) d ]
216= n/2 [ 2(1) + (1-1) 1]
216= n/2 (2)
216= n
umm...?
Pleas help!
thanks