dinero0424
21.07.2020 •
Mathematics
What is the value of r? What is the length of EB?
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Ответ:
r=9
EF = 55
Step-by-step explanation:
CF = ED
9r - 6 = 8r+3
Subtract 8r from each side
9r-8r - 6 = 8r-8r+3
r-6 =3
Add 6 to each side
r-6+6 = 3+6
r = 9
EF= CD = 4r+19
= 4*9+19
=36+ 19
=55
Ответ:
240 - 96 = 144 remains in the tank
April : 144 * 0.25 = 36 used
144 - 36 = 108 remains in tank
108 gallons left at the end of April