On both questions and show working out for question 20
for question 20, the answer is in cm

12

step-by-step explanation:

12 + 5 = 17

12x2=24

24-7=17

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!