X^{2} +16xy+63y ^{2}

Answers

Answer 1

Answer: $x^(2) +16xy+63y ^(2) \n = x^(2) +16xy+64y ^(2)-y ^(2) \n = (x+8y)^(2)-y ^(2) \n =(x+8y+y)(x+8y-y) \n =(x+9y)(x+7y)$

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The seventh term of an arithmetic sequence is 21, the tenth term is 126. The first term is

Answers

Hi,
$a_(10)=a_0+10*r\na_7=a_0+7*r\na_(10)-a_7=3\ \Rightarrow 126-21=3r\ \Rightarrow r=35\na_7=a_0+7*r\ \Rightarrow 21=a_0+7*35\n\Rightarrow a_0=-224\n\Rightarrow a_1=-224+35\n\boxed{a_1=-189}$

62+25=25+___ what's the answer? I'm only 2 grade

Answers

Answer: 62

Step-by-step explanation: 25 appears on both sides, so you can cancel them out. This leaves a 62 on the left side, so there also must be a 62 on the right side.

Is 1/4 rational or irrational

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a rational number can be written as a fraction with whole numbers
an irrational cannot be written as a fraction
1/4 is a fraction with whole numbers
(pi is irrational because it never ends and it's fraction form can only be estimated)

1/4 is rational

Any number that you can completely write down with digits ... and a fraction bar or decimal point if necessary ... is rational. 1/4 is the complete number so it's rational. It's as easy as that.

Solve.: -2 1/3 -(-5) A:-7 1/3 B: 2 2/3 C: 3 2/3 D: 3 1/3