4. Element X (like Weapon X my marvel fans), is a radioactive isotope such that every 47 hours, the mass decreases by half. Given the initial mass of the sample is 30 grams, how long would it take to reach 21 grams? Round to the nearest tenth

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

In the figure below, triangle rpq is similar to triangle rts. what is the distance between p and q? a. 24 b. 42 c.50 d. 54

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?