Answer:
a=3 and b=-2
Step-by-step explanation:
We are given that five terms of a quadratic sequence are
1 8, 21, 40, 65.
The nth term of this sequence
=
We have to find the value of a and b where a and b are integers.
For n=1
......(1)
For n=2
.....(2)
Subtract equation (1) from (2) we get
Using the value of a=3 in equation (1)
Hence, the value of
a=3 and b=-2
Density = Mass x Volume
D = 600g x 150
D = 90,000
Answer: 2x^2+2x-24
Step-by-step explanation:
2(x+4)(x−3)
=(2(x+4))(x+−3)
=(2(x+4))(x)+(2(x+4))(−3)
=2x^2+8x−6x−24
=2x^2+2x−24
8x-11 I believe
combine like terms
5+(-7)-9
Answer: 4 Notebooks
Step-by-step explanation:
The number of notebooks is x, the number of markers is 2x+3.
Since the price per notebook is $5 we can write it as 5x, And the price per marker is $2, we can write that as 4x+6
5x+4x+6=42
9x=36
x=4
so he bought 4 notebooks and 11 markers.
CHECK: 4*5=20 and 11*2=22 20+22=42