Use the ALEKS graphing calculator to find the vertex and x-intercept(s) for the quadratic function. f(x)=-2x^2-10x-15

Round to the nearest hundredth if necessary.
If there is more than one x-intercept, separate them with commas.
If applicable, click on "None".

vertex:?
x-intercepts(s): ?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.