Answer:
Problem 19: [tex]c=36[/tex]
Problem 20: [tex]y\geq 18[/tex]
Step-by-step explanation:
Problem 19
Step 1: Add 5 to both sides
[tex]\frac{c}{4} -5+5=4+5[/tex]
[tex]\frac{c}{4} = 9[/tex]
Step 2: Multiply both sides by 4
[tex]\frac{c}{4}*4 = 9 *4[/tex]
[tex]c=36[/tex]
Answer: [tex]c=36[/tex]
Problem 20
Step 1: Add 6 to both sides
[tex]y-6+6\geq 12+6[/tex]
[tex]y\geq 18[/tex]
Answer: [tex]y\geq 18[/tex]
