**Answer:**

10

**Step-by-step explanation:**

Means back the numbers into multiples of several small numbers

Like:; 1. We take LCM of 40

Just break into multiples of small number

40= 2×2×2×5

2. We take LCM of 50

50= 5×5×2

So LCM for 100 is 2×2×5×5

after that see the pairs in the LCM like 2×2 or 3×3 or 4×4(same numbers)

Then write the the single number in place of two multipled numbers

Like:; 2×2 is written as 2 // 3×3 is written as 3

So we can write 100 into 2×2×5×5 and then after selecting pairs (2×2)×(5×5)

write pairs in single number 2×5

And so we get 2×5=10

So we find root of 100 that is 10

**Answer:**

Y = $15H + (.07 * S)

**Step-by-step explanation:**

You didn't give the choices but this should be correct

**Her electricity bill will be of 14256 pence.**

__Explanation__

On average, Tanya uses 90 units of electricity per week.

So, the __total units of electricity in 12 weeks__ will be: units

One unit of electricity costs 13.2 pence.

Thus, __the total cost for 1080 units__ will be: pence.

**So, her electricity bill will be of 14256 pence.**

**Answer:**

5cm

**Step-by-step explanation:**

a^2+b^2=c^2

9+16=x^2

25=x^2

x=5

Hope this helps!