Question

God, somebody help me!!!

Answer 1

Answer:

Step-by-step explanation:

When solving proportions like these, you can set them up using fractions

#1:

$\frac{3}{9} = \frac{2}{x}\\\frac{1}{3} = \frac{2}{x}\\cross \: multiply\\x = 6\\3:9 = 2:6$

#2:

$\frac{57}{x} = \frac{19}{38}\\\frac{57}{x} = \frac{1}{2} \\x = 114\\57 : 114 = 19 : 38$

#3:

$\frac{7}{x} = \frac{2}{3} \\21 = 2x\\x = \frac{21}{2} = 10.5\\7:10.5 = 2:3$

#4

$\frac{15}{2} = \frac{x}{8}\\x = \frac{15*8}{2} = 60\\15:2 = 60:8$

#5

$\frac{0.3}{4} = \frac{9}{x}\\0.3x = 36\\x = \frac{36}{0.3} = 120 \\0.3:4 = 9:120$