If I sent out 200 letters and got 80 responses. If I want 20 more responses how many more letters do I have to send out

)a smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0 millimeters (depth). what is the volume of the smart phone in cubic centimeters? (1 in = 2.54 cm)

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.