1. Test whether the following terms are in proportion. a) 3,7,9,21
b) 6,8,18,20
c) 5:8 and 15:24
d)7:9 and 28:45

I don't want to tell you the answer but I will give you a hint

Step-by-step explanation:

Product of extreme terms = Product of middle terms

Good luck in finding your answer :)

2 and 1.

step-by-step explanation:

plug in each answer. 0 doesn't work, 1 does. so does 2. 4 doesn't:

0 = 1 is not true.

2 = 2 is true.

4 = 4 is true.

8 = 16 is not true.

hope this !

cant

step-by-step explanation: there is no picture