Answer:
90.
Step-by-step explanation:
By proportion, the number of students with a dog is predicted to be:
(16/50) * 280
= (8 / 25) * 280
= 89.6 so it is 90 students.
Answer:
42.54
Step-by-step explanation:
forty two minutes and fifty four seconds
The anwser for NO.4 is (2X+5)(2X-5)

Divide through all terms by

. Then, for instance, the first term in the numerator becomes

All other terms reduce similarly, giving the final product
13cm because c is the hypotenuse .with formulae right angle triangle of 5^2+12^2=13