Asystem of equations is shown. 7k+4l=20−8k+2l=10 what is the value of k?

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?