-124 = -7(5x+ 6)- 6x how do I solve this

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

To find the extreme values of a function f(x.y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x,y)=xy

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab