Question

I need help with these problems please and thank you

Answer 1

Answer:

Refractive index of a medium depends upon the refractive index of the surroundings

Answer 2

Answer:

5. There are 4 coins in every punch

6. There are 5 coins in every punch

7. There is 1 coin in every punch

8. There aren't coins in the punches

Step-by-step explanation:

5.

    $4x+2=18\\4x=18-2\\4x=16\\x=\frac{16}{4} \\x=4$

6.

    $3x+5=20\\3x=20-5\\3x=15\\x=\frac{15}{3}\\x=5$

7.

    $2x+10=9+3x\\x+-3x=9-10\\-1x=-1\\x=1$

8.

    $2x+14=14\\2x=14-14\\2x=0\\x=\frac{0}{2}\\x=0$