SweetJules77 SweetJules77

06-06-2015
Mathematics

contestada

Tony is 21 years older than his sister Danielle. In 13 years he will be twice as old as Danielle. How old is each of them now?

Respuesta :

06-06-2015

x-y=21 ⇒ x=y+21

x+13=2y

Substitute y+21 for x into the equation x+13=2y

So y+21+13=2y

Simplify 34=y

So Danielle is 34 years old. Plug y back in to the original equation

x-34=21

x=55

Tony is 55 years old

Answer Link

Otras preguntas

Who let the continued army to victory again inst the biritsh and thus won American independent

The hypothalamic-pituitary-end organ progression of hormones is best represented by _____________.

What happened to the u.s. during the year of 2011?

list all values of x such that 2 ((sin (x))^2)+((sqrt (3))sin(x))=(2sin (x)+sqrt (3))

Which political measure made colonists feel like Parliament was ignoring the traditions of self-government? A. a boycott of political activities in the colonies

What are the three main products of cellular respiration?

CuSO4(aq) and Zn(NO3)2 ionic equation

Who reaped most of the profits from western mining?

Usually, when you subtract 98 from a number, you need to

Cells lining the small intestine absorb glucose. Which of the following is required to transport glucose molecules across the cell membranes of the intestine?