Ex-4y =10 x - 4(60) = 10
-x-240 = 10
x-240 +240 - 10+240
L) - [250]
x=265
What error did Malik make first when solving the equation x-4y=10?
O Malik did not multiply (250) correctly.
O Malik added 240 to each side of the equation.
O Malik did not multiply Ex correctly.
O Malik substituted 60 for y instead of x.

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z