How did mendeleev arrange the elements?

The cost of 2 baseball bats, one aluminum, one wooden, is $300. If the aluminum bat costs $40 more than the wooden bat, how much does the aluminum bat cost?

Jerry received both the 15th highest and the 15th lowest grade in the class. how many students are there in the class?

In a circle with a radius of 7 feet, the radian measure of the central angle subtended by an arc with a length of 4 feet is? The area of the sector formed by the arc is? square feet. Assume π = 3.14, and round your answers to the nearest hundredth.

Mr Thomas is buying two types of gift cards to give to employees at a company meeting. he will buy restaurant gift cards that each coast $50. He will also buy movie theater gift cards that each coast $20. He has $450 to buy a total of 15 gift cards.

A motel bills its customers by charging a flat fee for the first night and then adding on a fixed amount for every night thereafter.

6. The College Board provided comparisons of Scholastic Aptitude Test (SAT) scores based on the highest level of education attained by the test taker's parents.

Box contains 6 transistors, 5 of which are defective. If 5 are selected at random, find the probability that a. All are defective. b. None are defective.

If two line segments are congruent, which following must be true?

3 (2x+1) = -5-5+3x solve the problem

Baileigh is using a piece of string to hang a painting on the wall. The back of the painting is diagrammed below. 36 cm 36 cm 15 cm 15 cm Note: Figure is not drawn to scale. What is the length of the string?