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OG12 OG16 OG17 OG15 In the xy-plane,region R consists of all the points (x, y) such that 2x + 3y ≤ 6. Is the point (r, s)in region R ?(1)3r +2s =6(2)r ≤ 3 and s ≤ 2
If r and s are positive integers, r is what percent Of s(1)r=$$\frac3 4s$$(2)r+s=$$\frac{75} {100}$$
Ready4

If , , and are constants, where , and for all numbers :

What is the value of ?
If r, s, and t are nonzero numbers, is rt= 14?1.$${（r^{2}）st}=14rs$$2.$$\frac{t}{2}=\frac{7}{r}$$
OG18-数学分册 What is the area of rectangular region R?(1) Each diagonal of R has length 5.(2) The perimeter of R is 14.
190215 The weight W of the object on the earth and the distance r between the object and the center of the earth satisfy the equation W=K/r^2. When r = 4000, w = 200. When r = 5000, what is w equal to?
If r, s, and w are positive numbers such that w = 60r + 80s and r + s = 1, is w < 70?(1)r > 0.5(2)r > s
191222 还原机经选题: 数论&amp;代数 p q r are positive integers, p+q+r=5, how many factors does $$2^p3^q5^r$$ have?
(1)p+q=3
(2)q+r=3
Does r- s= 52?(1) r = -s-2(2) S = -27 and r = 25
PREP07 Test 1 If 0 < r < 1 < s < 2, which of the following must be less than 1?I. $$\frac{r}{s}$$II. rsIII. s - r
OG18 OG19 OG20 OG2022 If r and t are three-digit positive integers, is r greater than t?(1) The tens digit of r is greater than each of the three digits of t.(2) The tens digit of r is less than either of the other two digits of r.
Is r greater than 0.27?(1)r is greater than$$\frac1 4$$(2)r is equal to$$\frac3 {10}$$
PREP07 Test 1 Is the integer r divisible by 3 ? (1) r is the product of 4 consecutive positive integers.(2) r < 25
OG20 OG2022 If R, S, and T are points on a line, and if R is 5 meters from T and 2 meters from S, how far is S from T ? 1.R is between S and T. 2.S is to the left of R, and T is to the right of R.
PREP07 Test 1 If r and s are positive integers, is $$\frac{r}{s}$$ an integer?(1)Every factor of s is also a factor of r.(2)Every prime factor of s is also a prime factor of r.
If P and R are positive, is 25 percent of P equal to 10 percent of R?(1) R is 150 percent greater than P.(2) P is 60 percent less than R.
OG18-数学分册 If $$rs\neq 0$$, is $$ \frac{1}{r} + \frac{1}{s} = 4$$(1) r + s = 4rs(2) r = s
OG20 OG2022 If r and s are positive integers, is r + s even? 1.r is even. 2.s is even.
OG19-数学分册 What is the area of rectangular region R? (1) Each diagonal of R has length 5. (2) The perimeter of R is 14.
PREP07 Test 2 If r and t are positive integers, is rt even?(1) r + t is odd.(2) r^t is odd.