 , 25.01.2020 20:31 toddjordan1928

# Lucia finds that (3x²+3x+5)+(7x²-9x+8)=10x²-12x+13. what error did lucia make? a)she found the difference instead of the sum. b)she combined the terms 3x² and 7x² incorrectly. c)she combined the terms 3x and –9x incorrectly. d)she did not combine all like terms.   ### Another question on Mathematics Mathematics, 21.06.2019 16:30
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Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?
Lucia finds that (3x²+3x+5)+(7x²-9x+8)=10x²-12x+13. what error did lucia make?

a)she fo...
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