The ratio of boys to girls in a certain school is 5:6. If there are 420 girls, how many boys are there? (put solution)

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?