Look here: https://www.desmos.com/calculator/utvzehytup

It is just a rectangle

The answer is: (3,3)

23 + n =78

n= 78 - 23

n= 55

знак деления

one of them Gomer the other is Goober i mixed up them too at the first time :DD

it is d

i think:

minus all the cards with heart on it:

52*(3/4)=39

minus all the cards with 6:

39-3=36 (3 because we already have minused one 6 with heart on it)

The probability: 36/52 = 0.6923076923076923(70%)

\(\text{use the quadratic formula :} \\x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)

here is the roots:

http://www.cymath.com/answer.php?q=2x%5E2-8x%2B7%3D0

\(176-96=80\\ 96:80\\ 6:5\)

Answer: 6:5

2099.8

0

\(32 = 2(k – 34)\\ \frac{32}{2}=\frac{2(k-34)}{2}\\ 16=k-34 \\ \text{add to both sides 34: }\\ 16+34=k-34+34\\ 50=k\)

\(2(a^2-25)=21a\\ a^2-25=10.5a\\ a^2-10.5a-25=0\)

Do the rest by yourself then write the answer

http://www.cymath.com/answer.php?q=a^2-10.5a-25%3D0

\(w=\frac{7}{8},-\frac{7}{8}\)

there is two unknowns

Here is the graph:

https://www.desmos.com/calculator/dsl83ietui

\(13^2-3^2=x^2\\ x=\sqrt{160}=12.6491106406735173\)

Answer: 12.6