Suppose a, b,c and d are positive real numbers that satisfy the system of equations (a+b) (c+d)=143
(a+c) (b+d)=150
(a+d) (b+c)=169
Compute the smallest possible value of a²+b²+c²+d²

Which unit of measure would be the most appropriate to measure the capacity of a bottle of nail polish? a.fluid ounces b.cups c.pints d.quarts e.gallons

While scuba diving, rajeev dove to a depth of 12.6 feet below the surface of the water and then descended another 8.7 feet. what expression can be used to find rajeev's new position? 12.6 – 8.7 –12.6 – 8.7 –12.6 – (–8.7) 12.6 – (–8.7)

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)