Solve the following equation for A : 2A 3 = 8 + 4A……

单项选择题Suppose that, in each trial, either electrons or protons had been added to each sphere to produce its charge. In Trial 3, which of the 2 types of particles would have been added to Sphere X, and which of the 2 types of particles would have been added to Sphere Y ?

单项选择题Suppose that Sphere X had become unfastened from the floor of the vessel during Trials 1 and 7. During which of these trials would Sphere X more likely have undergone the lesser amount of acceleration?

单项选择题Based on the chemical equation in the passage, in a ZAB, as 5 02 molecules are consumed, how many Zn atoms, if any, must also be consumed?

单项选择题For a project in Home Economics class, Kirk is making a tablecloth for a circular table 3feet in diameter. The finished tablecloth needs to hang down5inches over the edge of the table all the way around.To finish the edge of the tablecloth, Kirk will foldunder and sew down 1inch of the material all aroundthe edge. Kirk is going to use a single piece of rectan-gular fabric that is 60 inches wide. What is the shortestlength of fabric, in inches, Kirk could use to make thetablecloth without putting any separate pieces of fabrictogether?

单项选择题Based on Figure 1, for each tree species, the number of seeds that were dispersed per m2 in Plot X must have been:

单项选择题According to the data in Figure 3, what effect, if any,did removing the herbaceous layer have on the percent distribution among the 1-year-old seedlings in the 1-hectare area of the forest? The removal of the herbaceous layer:

单项选择题Bill hit his car into a wall last night.

单项选择题John speaks French as fluently as he does German.

单项选择题It may be more of a suggestion than an invitation.

单项选择题In the standard (x,y) coordinate plane, what is the slope of a line that is perpendicular to 2x- 3y = 9 ?

单项选择题The length of a rectangle is 4 inches longer than the width. The perimeter of the rectangle is 28 inches.What is the width of the rectangle, in inches?

单项选择题James plans to __________ offers from other companies before making a decision.

单项选择题（）makes his shop different is that it offers more personal services.

A.What
B.Who
C.Whatever
D.Whoever

单项选择题99%of the time，we（）.

A.pay no attention to our gestures and body movements
B.are aware of our gestures and body movements
C.know what the meaning of other persons gestures and body movements
D.All of the above

单项选择题Doctor Reef lives a ___________ life