PLEASE PLEASE HELP ASAP Which of the following statements is true about the graphs of y=2x-4 and y=-1/2x+3
a. They are perpendicular.
b. They have the same slope.
c. They intersect, but they are not perpendicular.
d. They have the same y-intercept.

The diagram shows a 7cm by 6cm rectangle based pyramid. all the diagonal sides - ta, tb, tc and td are length 10cm. m is midpoint of rectangular base. work out height mt to 1 decimal place

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?