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190215 $$a^{2}$$ - $$b^{2}$$=21.$$a^{4}$$ - $$b^{4}$$=? 1：a+b=-3 2：a-b=7
PREP07 Test 2 If zt < -3, is z < 4 ?(1) z < 9 (2) t < -4
190113 还原机经选题: 数论&amp;代数 (($$\frac{1}{3})^{2}+\frac{1}{3}*\frac{1}{4}$$)*(($$\frac{1}{3})^{2}-\frac{1}{3}*\frac{1}{4}$$)=?
KMFPS How many of the integers that satisfy the inequality (y+1)(y+2)(y+4)≥0 are less than 4?
190310 $$\frac{4- \sqrt{28}}{\sqrt{9+7}}$$ = ?
排列组合 How many 4-digit positive integers are there in which all 4 digits are even?
PREP07 Test 2 If |x + 2| = 4, what is the value of x ?(1) x^2 ≠ 4(2) x^2 = 36
190215 f(x)=a$$(x+h)^{2}$$+k.a=? 1：f(2)=2 2：f(-1)=-4,f(x) ≤ 4
190215 a=$$2^{4}$$,b=$$a^{4}$$,$$2^{x}$$=$$a^{b}$$.x=？
Ready4

The ratio 3 to 1 4 is equal to the ratio
Ready4

A positive number  is multiplied by 3, and this product is then divided by 4. If the square of the result of these two operations equals , what is the value of ?
Is ab> 35?1. -4 < a < 3 and -5< b<4.2. a < 5 and b <7.
190124 $$\frac{4+\sqrt{28}}{\sqrt{9}+7}$$=?
Magoosh In the county of Veenapaniville, there are a total of 50 high schools, of three kinds: 25 public schools, 16 parochial schools, and 9 private independent schools. These 50 schools are divided between three districts: A, B, and C. District A has 18 high schools total. District B has 17 high schools total, and only two of those are private independent schools. If District C has an equal number of each of the three kinds of schools, how many private independent schools are there in District A?
Magoosh If 2x - y = 10 and$$ \frac{x}{y} = 3$$, then x =
Magoosh When 100 is divided by positive integer x, the remainder is 2. What is the remainder when 198 is divided by x?
Magoosh In a group of 50 students, 31 are taking French, 17 are taking Spanish, and 10 are taking neither French nor Spanish. How many students are taking both French and Spanish?
Magoosh What is the average (arithmetic mean) of $$(\sqrt{8}+\sqrt{2})^{2}$$and $$(\sqrt{8}-\sqrt{2})^{2}$$ ?
Magoosh If the mean of list A is 6.8 and the standard deviation is 3.6, then how many elements of list A are within 1 unit of standard deviation of the mean?A = {2, 9, 2, 6, 9, 10, 7, 4, 5, 14}
Magoosh In 2008, the total revenue from movies was 842.1 million dollars. If Rocky XII generated 4.2 million dollars in revenue, approximately what percent of the total revenue was generated by Rocky XII?