A builder has some red and grey bricks. The red bricks weigh 7 kilograms each, and the grey bricks weigh 8 kilograms each. If the total weight of all 34 bricks is 253 kilograms, how many of each type of brick does Mark have?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms