Factorise the following by grouping pairs (1) a2_9a+3a_27

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices