How can you tell that x2 - 19x + 90 is not a perfect square trinomial?

Jireh flew his crop duster from the ground to an altitude of 3,500 feet. He continued to fly at that height for 20 minutes until he descended to 2,000 feet. He then flew back to the ground and landed his plane.

How do I know that a fraction corresponds to a repeating decimal

Jacob wants to buy some apples for a class party. shop a sells apples at $3.99 for 4. shop B sells apples at $4.99 for 5. Jacob does some calculations and decides that the apples at shop a are cheaper. explain if Jacobs reasoning is correct.

A bag has 10 marbles and 4 are black. Joseph picks 2 marbles without replacing the first. What is the probability that both are black?

Yamini has 12 more 100 rupee notes than 50 rupee notes. She has R$ 3900 total, how many notes of each kind she has?

3x-5y+6z=4 x-3y+5z=-5 2x-4y+z=13

Find the center and the radius of the circle with the equation x^2+6x+y^2+4y+10=1

Divide X+2/2x^2+7x+7

Each child in a class needs 5 exercise books and 4 pencils. If there are 30 children, how many exercise books and pencils are needed? Exercise books= Pencils=

Whats gcf of 16 and 32