Apolar bear swims 390 meters at a constant rate in 150 seconds. what is the speed of the polar bear

Maria donates a fixed amount, a, to a charity each month. if she donates $300 in 12 months, what is the equation for a? a. a + 300 = 12 b. a × 300 = 12 c. a × 12 = 300 d. a + 12 = 300 e. a + 32 = 100

With alll of except for the 2 that i did already

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom