What shape is this cross-section?

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?