8.
a) To find how many matches are used to make shape 9, you substitute 9 in as n, so your equation looks like
m = (4 × 9) + 1
m = 36 + 1
m = 37
So the amount of matchsticks is 37
b) Now we can substitute in 21, but place it where m is, so we get:
21 = (4 × n) + 1
- 1
20 = 4 × n
÷ 4
5 = n
So your answer is shape number 5.
9. You can write this out as an equation:
(6 × l) + (8 × p) = 640
Because you know that each letter is 100, you can substitute 100 in for l and get
(6 × 100) + (8 × p) = 640
600 + (8 × p) = 640
- 600
8 × p = 40
÷ 8
p = 5
So each pen is 5g.
I hope this helps!
Answer:
it is 803.84 centimeters squared
Step-by-step explanation:
area of a circle is r^2* 3.14
=16*16*3.14
=803.84
Answer:
18in cubed
Step-by-step explanation:
area times height equals volume. so,
13.5×1⅓=18.
so, the volume is 18in cubed.
A1 = 3 and an = an − 1 − 3
a1 = 2 and an = an − 1 + 0.5