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Sever21 [200]
2 years ago
11

1. Factorise the expressions.a2a2 + 2ad + 2ac - ab - bd - bc​

Mathematics
1 answer:
Ugo [173]2 years ago
6 0
There's the only answer i've got

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All of the following effect the wind motion EXCEPT
iVinArrow [24]

Answer:

I think option D.

Step-by-step explanation:

lmk if it's wrong

7 0
2 years ago
Please help me with this!!
9966 [12]

Answer:

C

Step-by-step explanation:

3 0
2 years ago
The average income, I, in dollars, of a lawyer with an age of x years is modeled with the following function: I = -425x^2 + 45,5
lord [1]

We are given

The average income, I, in dollars is

I=-425x^2+45500x-650000

(a)

now, we are given

average income is $275000

so, I=275000

now, we can set them equal

and then we can solve for x

275000=-425x^2+45500x-650000

-425x^2+45500x-925000=0

we will have to use quadratic formula

x=\frac{-45500+\sqrt{45500^2-4\left(-425\right)\left(-925000\right)}}{2\left(-425\right)}:\quad \frac{-\sqrt{45500^2-1572500000}+45500}{850}

x=\frac{-45500-\sqrt{45500^2-4\left(-425\right)\left(-925000\right)}}{2\left(-425\right)}:\quad \frac{\sqrt{45500^2-1572500000}+45500}{850}

we get

x=27.28199

x=79.776

we need to find youngest age

It means that we need to choose smallest value

so,

x=27............Answer

(b)

we are given

x=40

so, we can plug it and find I

I=-425(40)^2+45500(40)-650000

I=490000..............Answer

6 0
3 years ago
Y less than x minus 3
MariettaO [177]
I assume you want the expression to this so it would be x-y-3
6 0
3 years ago
Which of the following is an arithmetic sequence?
alexandr1967 [171]
Answer: Only the second sequence is arithmetic. 

Work:
An arithmetic sequence is a sequence in which there is a common value added or subtracted between each term in the sequence. 
The first option, -2, 4, -6, 8,... is not arithmetic because the terms switch back and forth between positive and negative signs meaning that there is no common value that can be added between each term. 
The second option, -8, -6, -4, -2,... is arithmetic because there is a common difference between each term which is +2.
The third option, 2, 4, 8, 16,... is not arithmetic but is, in fact, geometric. There is no common value that is added or subtracted between each term. 
8 0
3 years ago
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