Two cellphones received a text message at the same time. both phones blinked as they received the message. one phone blinks every 2 minutes. the other phone blinks every 5 minutes. in how many seconds will they blink together?

Draw a scaled copy of the circle using a scale factor of 2

Solve the triangle. a = 21°, c = 105°, c = 5

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.