Kia is twice as old as her brother, Dan. If the sum of their ages is 42 years, how old are Kia and her brother?

Kia is twice as old as her brother, Dan. If the sum of their ages is 42 years, how old are Kia and her brother?

I don't understand how to solve it, and I am very in need of help!

this is my first time doing these type of problems and i have no idea where to start and where to finish. could you please help

A plane can fly 180 mph in calm air. Flying with the wind, the plane can fly 594 mi in the same amount of time it takes to fly 486 mi against the wind. Find the rate of the wind.

The owner of Nuts2U Snack Shack mixes cashews worth $5.50 per pound with peanuts worth $2.00 per pound to get a half pound, mixed-nut bag worth $1.80. How much of each kind of nut is included in the...

The negative of a certain number divided by three more than that number is less than four more than the number. Find the solutions that satisfy this inequality.

One of the equal sides of an isosceles triangle is 3 metres less than twice its base. The perimeter is 44 metres. Find the lengths of the sides.

An exam worth 145 points contains 50 questions. Some of the questions are worth two points and some of the questions are worth five points. How many of each type question are on the test?

I really need this question answered by 1045. i have been stuck forever now and its making me so mad.

A bag contains green marbles and red marbles, 83 in total. The number of green marbles is 7 less than 4 times the number of red marbles. How many green marbles are there?

I need help with this problem I don't even know where to start.

A model rocket is launched straight upward from the side of a 212-ft cliff. The initial velocity is 86 ft/sec. The height of the rocket h(t) is given by: h(t)=16^2+86t+212...

Big Ideas Math saids that I am wrong even though I think I am right.

i dont understand ):

Two high-speed ferries leave at the same time from a city to go to the same island. The first ferry, the Cat, travels at 33 miles per hour. The second ferry, the Bird, travels at 27 miles per hour...

Graph the function with the given description. A linear function f models a relationship in which the dependent variable decreases 4 units for every 2 units the independent variable increases...

How do I do this?

The airline cost for x passengers, measured in thousands of passengers, to travel round trip from New York to Atlanta is given by c(x)=the square root 0.3x+1 where c(x) -s measured in millions...

(a) If t represents the amount of minutes it took Michelle to drive to work, then write and expression in terms of t for the amount of minutes it took Michelle to drive home from work. (b) If...

If the sides of a square are increased by 2 meters, the area becomes 81 meters. Find the length of a side of the original square.