So you start with 23
for every row up you have -3
equation is
# of boxes= 23- 3x
x representing the number of rows above the bottom
# of boxes= 23- 3x=
23-3(5)= 8
5 for the top row
bottom row has 23
1 row above 23-3(x)=20
2 row above 23-3(x)= 17
3....23-3(x)= 14
4....23-3(x)=11
5...23-3(x)= 8
therefore just add all boxes each row has
23+20+17+14+11+8= 83
I hope this helps
Add the 3 numbers that you know.
Multiply the mean of 73 by 5 (numbers you have).
Add the numbers you are given.
Subtract the sum you have from the total sum to find your missing number.
Answer:
w = 18; l = 62
Step-by-step explanation:
The formula for perimeter of a rectangle is P = 2l + 2w, where l represents length and w represents width
We know that the length can be found using the equation l = 3w + 8
Plugging this in for l in the original formula for perimeter gives us 160 = 2 * (3w + 8) + 2w
160 = 6w + 16 + 2w
160 = 8w + 16
144 = 8w
18 = w
Plugging 18 in for the second equation gives us 3 * 18 = 54 + 8 = 62 = l
Answer:
Step-by-step explanation:
Factorise the denominator of the second fraction
y² - 1 = (y - 1)(y + 1) ← difference of squares
To obtain a common denominator
multiply numerator/ denominator of first fraction by (y + 1)
= 
- 
← subtract numerators leaving the common denominator
= 
= 
= 
← cancel common factor (y - 1) on numerator/denominator
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