Doboman

THERE IS A CALCULATOR ON THIS SITE YOU KNOW!!!

but I'll answer it anyway;

sqrt(112) = 10.5830052442583624

n²(n + 1)² / 4 + 4(n + 1)³ / 4

n²(n + 1)² / 4 = n²(n² + 2n + 1) / 4 = (n⁴ + 2n³ + n²) / 4

4(n + 1)³ / 4= n³ + 3n² + 3n + 1

n⁴ + 2n³ + n² + 4n³ + 12n² + 12n + 4 = (n⁴ + 6n³ + 13n² + 12n + 4) / 4

This is a maths website with a calculator on it. It is there for a reason!

-9x - 3(-1) = -6

-9x + 3 = -6

-9x = -9

x = 1

-2(4x-1) = -8x + 2

-8x + 2 = -5x - 7

 3x = 9

x = 3

10¹⁰⁰⁰

90% = 0.9

2000 / 0.9 = 2222.22...

2100 / 12 = 175

2222.22 + 175 = 2397.22...

Key= 1|3 means 1.3

(i) 0| 4 5 6 6 6 8 8 9 9 9

    1| 2 2 3 4

    2| 1 4 5

    3|

    4| 0 5

(ii) Most people died within 1 year and very few survived after 2.     

1. 1/10

2. 1/5 OR 2/10

3. 2/5 OR 4/10

4. 7/10

You know this website has a calculator, right?