Mathematics, 19.02.2020 05:48, Dancy31uv

The length of a rectangle is 2 units more than the width. The area is 63 units. What is the width, in units, of the rectangle?

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First, let's write what the question says in equation form:

(The length of a rectangle is 2 units more than the width)
L = w + 2

(The area is 63 units)
L * w = 63

Since we already know the value of L ('w + 2'), we can simply input that into the equation to solve for area:

L * w = 63
(w + 2) * w = 63

w^2 + 2w = 63
Subtract both sides by 63:

w^2 + 2w - 63 = 0
Factor:
(w + 9)(w - 7) = 0

We get two answers:
{-9, 7}
Since the width can't be negative, the only possible answer is 7.

w = 7

We can input 'w' into the first equation:
L = 7 + 2
L = 9

The width is 7 units, and the length is 9 units,

-T.B.

answered: Guest

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.

answered: Guest

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺

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The length of a rectangle is 2 units more than the width. The area is 63 units. What is the width, i...