4
-60
Write down both equations (I'll label them (1) and (2)):(1) a = 3b - 4(2) a + b = 16Pass b to the left side of the equation (1):(1) a - 3b = -4(2) a + b = 16Multiply (1) by -1:(1) -a + 3b = 4(2) a + b = 16Add down both equations:-a + 3b + a + b = 4 + 164b = 20b = 5Replace b in (2):a + 5 = 16a = 11
5g = 1b (5 girls for every 1 boy) Xg = 20b (unknown number of girls for every 20 boys.) It looks like the answer is as easy as multiplying 20 by 5, which equals 100. Why? Well if you actually had a bunch of girls and boys together, you would get 20 boys and ask that 5 girls go to each boy. Then imagine in your head how many girls there are around the 20 boys, even if you have to draw a picture.
125
4(a+5b)
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b
no
If it's a Conn trumpet, it's the model number. The Conn 20B is a student model horn.
20b rotary
40b2
20B to 20 KB
The Electric Company - 1971 20B 6-20 was released on: USA: 12 November 1976
4
-(5b - 4)(25b2 + 20b + 16)
4(4b + 5)(16b2 - 20b + 25)
-60