Whoever answer this question with explanation gets marked the brainiest

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

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?

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20