Adrian is going to invest in an account paying an interest of 6.5% compound quarterly. How much would Adrian need to invest to the nearest hundred dollars, for the value of the account to reach $3900 in 14 years?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4