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3 years ago

4.9-16=. A:25 B:7 C:-25 D:-7

Mathematics

1 answer:

shtirl [24]3 years ago

8 0

Answer and Step-by-step explanation:

It says your question is : $9-16=?$ And the answer for that would be $-10$ . But that's not there in the options I think your question was supposed to be meant like this : $16-9=?$ cause then it would be $7$ tho it's there in the options, the sign is wrong it's not $-7$ it's $+7$ or just $7$ .

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What is the solution to he equation (y/y-4)-(4/y+4)=3^2/y^2-16

kicyunya [14]

Answer:

$y=\pm i \sqrt{7}$

Step-by-step explanation:

Given equation is $\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{3^2}{(y^2-16)}$

Factor denominators then solve by making denominators equal

$\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{3^2}{(y^2-16)}$

$\frac{y}{\left(y-4\right)}-\frac{4}{\left(y+4\right)}=\frac{9}{(y+4)\left(y-4\right)}$

$\frac{y\left(y+4\right)-4\left(y-4\right)}{\left(y-4\right)\left(y+4\right)}=\frac{9}{(y+4)\left(y-4\right)}$

$y\left(y+4\right)-4\left(y-4\right)=9$

$y^2+4y-4y+16=9$

$y^2=9-16$

$y^2=-7$

take squar root of both sides

$y=\pm \sqrt{-7}$

$y=\pm i \sqrt{7}$

Hence final answer is $y=\pm i \sqrt{7}$ .

7 0

4 years ago

PLEASE PLEASE I WILL MARK AS BRAINLIEST!!!!!!!

SOVA2 [1]

4t+6s=4524
t+s=925

Multiply the second equation by -4 to cancel the variable t
4t+6s=4524
-4t-4s=-3700
2s = 824
Divide both sides by 2
S= 412

925-412= 513
T=513

7 0

3 years ago

Eddie had 30 dollars to spend on 3 gifts. He spent 11

OverLord2011 [107]

Answer:

12.9 or 12 9/10

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2 years ago

What is the sum of 2/7 + 2/5 ?<br> please help 10 points and brainlest

omeli [17]

Answer:

2/7 + 2/5=24/35