Anja is creating a triangle using three straws. the two shorter straws have lengths of 20 cm and 21 cm. how long, in centimeters, should the third straw be for anja to create a right triangle?

Length of third straw must be:

29 cm

Step-by-step explanation:

We know that the longest side in a right angled triangle is its hypotenuse.

Pythagoras theorem says that:

hypotenuse²=base²+perpendicular²

Here, we are given base and perpendicular and we have to find the length of the hypotenuse.

hypotenuse²=20²+21²

                   =400+441

                  =841

hypotenuse=√(841)

                  = 29 cm

Hence, length of the third straw must be:

29 cm

y = 2x

step-by-step explanation:

if you divide each number in the sequence, you'll see that they all have a multiple factor of 2. each number in the series, and any other numbers which may continue, will be multiplied by 2. therefore, y is the next number in the sequence, and x is the current one, so, our formula will be y = 2x.