Santosh is four more than three times the age of his cousin. if santosh is 49 years old, then what is the age of his cousin?
identify the two operations, in their appropriate order, needed to solve this equation.
subtract and then multiply.
add and then multiply.
subtract and then divide.
add and then divide.

Asquare has a perimeter of sixteen centimeters. what is the length of each of its sides? a. 8 cm c. 9 cm b. 4 cm d. 10 cm select the best answer from the choices

Prove that quadrilateral is a rhombus.

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.