If the gradient of a line C is 2/3 what is the gradient of the line which is perpendicular to C

Students buying lunch at rockwell elementary school yesterday chose either burritos or pizza. 185 students chose burritos and 252 chose pizza. 1. estimate the number of students who brought lunch by rounding each number to the nearest hundred. 2. estimate how many students bought lunch by rounding each number to the nearest ten. 3. find the total number of students who brought lunch. which of your estimates is closer to the actual total? explain. 4. draw a figure on a sheet of paper. estimate how many pennies will fit inside the figure. check your prediction using pennies.

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet