How is a²-4a-21 expressed in factored form?

(x-1) (x+21)

(x-21) (x+1)

(a-7) (a+3)

(a-3) (a+7)

How do I know if a triangles are not similar

Evaluate the expression for the given values. p + q when p = 15 and q = 12

The total cost C for p pounds of lithium if each pound cost $5.44 Write a function rule using c and p as variables

Malachi is practicing math fluency. He has 100 math operation flashcards with 42 addition problem cards, 56 subtraction cards, and 2 multiplication cards. He will time himself to see how fast he can solve the problems on two cards.

How do you write 15 thousanths?

Lily swims a 100-meter race. she swims the first half in 27.8 seconds. she swims the second half in 30.12 seconds. how long does it take lily to swim the whole race?

Lee's family had a garden in the shape of a right triangle. The total area of the garden is 16 square feet.

A can of soup has a volume 12 fluid ounces about how many milliters is this? A) 12 mL B) 120mL C) 29.6mL D) 355mL

A shoe store is offering a 25% discount on all pairs of shoes in the store. Every store employee gets an addtional 15% off the already discounted price. How much will an employee have to pay for a pair of shoes that has an original price of $80? A.

A rectangular solid has sides of 4cm, 6cm, and 8cm. What is it's surface area?