The operation of addition is closed for the set of all integers. true or false?

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

Urgent need asap △abc is similar to △xyz. also, side ab measures 6 cm, side bc measures 18 cm, and side xy measures 12 cm. what is the measure of side yz ? enter your answer in the box.