Can somebody please help me

Let’s use the Pythagorean theorom!

A^2+B^2=C^2

10^2+B^2=15^2

100+B^2=225

B^2=125

Un square it

≈11.2 cm

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9