I believe it is a rational number
Answer: 19.5÷70.59= 0.276
0.276×100=27.6%
Step-by-step explanation:
step 1. the perfect square will look like this: (7x + a)(7x + a) = (7x + a)^2.
step 2. by performing FOIL you will get 49x^2 + 14xa + a^2.
step 3. 14a = 84. a = 6
step 4. a^2 = 36.
step 5. k = 36.
sin 90 is simply 1, pretty straightforward
12 cm high is about 4.7 inches high