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OG12 OG15 Which of the following describes all values of x for which $${1}-{x}^{2}\geq{0}$$?
A circular table has a glass center with a diameter of 4x inches, which is surrounded by a metal ring with a width of 2 inches. In terms of x, what fraction of the table's surface is made up by the metal ring?
What is the value of $$a^{-2}b^{-3}$$?(1)$$a^{-3}b^{-2}=36^{-1}$$(2)$$(ab)^{-1}=6^{-1}$$
OG19-数学分册 Is the positive integer n odd? (1) $$n^{2} + {n+1}^{2} + {n+1}^{2} $$is even. (2) $$n^{2} - {n+1}^{2} + {n+1}^{2} $$is even.
OG19-数学分册 If $$x + y + z > 0$$, is $$z > 1$$ ? (1) $$z>x+y+1$$ (2) $$x + y+ 1 < 0$$
$$\frac{1}{{1}-\mathbf({\frac{1}{{2}-\frac{1}{3}}\mathbf)}}$$
181215 $$\frac{(n+1)!}{(n+1)!+(n+2)!}$$=?
190113 According to the number axis in this picture, |y-x|=2*|z-y|, and |y|=2/7*|x|. If y= -2, z=?
OG19-数学分册 Stephanie has 2$$\frac{1}{4}$$ cups of milk on hand and makes 2 batches of cookies, using $$\frac{2}{3}$$ cup of milk for each batch of cookies. Which of the following describes the amount of milk remaining after she makes the cookies?
Magoosh What is the value of$$x^2+$$$${1}\over{x^2}$$ ?(1) $$x+{{1}\over{x}}= 2$$(2) $$x^2-1=0$$
OG12 OG15 OG16 If n is a positive integer, is$${(\frac{1}{10})}^{n}<0.01$$(1)$$n >2$$(2)$$(\frac{1}{10})^{n-1}<0.1$$
If r and t are positive integers, what is the value of t?(1) $${t}^{r-1}={1}$$(2) $$r \neq 1$$
191222 730高分节-数学测试 $$ 1 + x + x ^ { 2 } + x ^ { 3 } + x ^ { 4 } < \frac { 1 } { 1 - x } ?$$
(1)x<1
(2)x>0
PREP07 Test 2 If x and y are greater than 0, is x = 1 ?(1 )$$\frac{x}{y}= 1$$(2) xy = 1
190207 (n-1)*n!+(n-1)!*n=?
A coat's original price of $112 was reduced by 20 percent for a sale. If the sale price was then reduced by 20 percent, which of the following expresses the price of the coat after the second price reduction?
PREP07 Test 1 If xy + z = x(y + z), which of the following must be true?
Manhattan What is the average of $$\frac{1}{8},\frac{3}{8},\frac{1}{2}$$ ?
Ready4

In an organization, one tenth of the male staff members and one fourth of the female staff members are involved in sports. If the total number of male staff is half of the number of female staff, then what fraction of the total staff plays sports?
181215 In the xy coordinate system, what is the coordinate of the point that is symmetric with respect to the line y=x relative to point P(-1, -2)?