3 years ago

Emma is thinking of three numbers from 1 to 9 that have the sum of 20 find of the possible numbers

1 answer:

6 0

9+9+2=20
9+8+3=20
9+7+4=20
9+6+5=20
(These ones are kin of repeated but in a different order:)
9+5+6=20
9+4+7=20
9+3+8=20
9+2+9=20

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What is the coeffieent of (x^4)(y^4) in the expansion of (x+y)^8

kap26 [50]

ANSWER

The coefficient is 70.

EXPLANATION

The given binomial expression is

$(x+y)^8$

The specific term of a binomial expansion can be determined using the formula,

$T_{r+1}= nC_ra^{n-r}b^r$
where

$n=8,r=4,a=x,b=y$

We substitute these values into the formula to get,

$T_{4+1}= 8C_4x^{8-4}y^4$

We simplify to get,

$T_{5}= 70x^{4}y^4$

Hence the coefficient is 70.

4 0

3 years ago

2x + 3y = -1 5r 2y = 12?

Lina20 [59]

That’s correct i think:)

3 0

3 years ago

Read 2 more answers

What number can replace the n in n/12 to make it equivalent to 1/2 ? 6 8 9 10

Ierofanga [76]

Answer:

i believe the answer is 6.