1. A reading activity is introduced to help third graders improve their reading. A class of 21 students takes part in the activities for 8 weeks. A control class of 23 students has the same curriculum minus the activities. At the end of the 8 weeks, all students are given a reading test. The average and standard deviation of the treatment groups scores are 51.41 and 11.01, respectively. The average and standard deviation of the control group scores are 41.52 and 17.15, respectively. Is there evidence that mean reading score increased

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

Aplot of land has been surveyed for a new housing development with borders ab, bc, dc, and da. the plot of land is a right trapezoid with a height of 60 feet and an opposite leg length of 65 feet

How many solutions does the nonlinear system of equations graphed below have?