Difference between revisions of "2014 AMC 8 Problems"
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==Problem 9== | ==Problem 9== | ||
+ | In <math>\bigtriangleup ABC</math>, <math>D</math> is a point on side <math>\overline{AC}</math> such that <math>BD=DC</math> and <math>\angle BCD</math> measures <math>70^\circ</math>. What is the degree measure of <math>\angle ADB</math>? | ||
+ | |||
+ | <asy> | ||
+ | size(300); | ||
+ | defaultpen(linewidth(0.8)); | ||
+ | pair A=(-1,0),C=(1,0),B=dir(40),D=origin; | ||
+ | draw(A--B--C--A); | ||
+ | draw(D--B); | ||
+ | dot("$A$", A, SW); | ||
+ | dot("$B$", B, NE); | ||
+ | dot("$C$", C, SE); | ||
+ | dot("$D$", D, S); | ||
+ | label("$70^\circ$",C,2*dir(180-35));</asy> | ||
+ | |||
+ | <math>\textbf{(A) }100\qquad\textbf{(B) }120\qquad\textbf{(C) }135\qquad\textbf{(D) }140\qquad \textbf{(E) }150</math> | ||
[[2014 AMC 8 Problems/Problem 9|Solution]] | [[2014 AMC 8 Problems/Problem 9|Solution]] |
Revision as of 08:44, 27 November 2014
Contents
- 1 Problem 1
- 2 Problem 2
- 3 Problem 3
- 4 Problem 4
- 5 Problem 5
- 6 Problem 6
- 7 Problem 7
- 8 Problem 8
- 9 Problem 9
- 10 Problem 10
- 11 Problem 11
- 12 Problem 12
- 13 Problem 13
- 14 Problem 14
- 15 Problem 15
- 16 Problem 16
- 17 Problem 17
- 18 Problem 18
- 19 Problem 19
- 20 Problem 20
- 21 Problem 21
- 22 Problem 22
- 23 Problem 23
- 24 Problem 24
- 25 Problem 25
Problem 1
Harry and Terry are each told to calculate . Harry gets the correct answer. Terry ignores the parentheses and calculates . If Harry's answer is and Terry's answer is , what is ?
Problem 2
Paul owes Paula 35 cents and has a pocket full of 5-cent coins, 10-cent coins, and 25-cent coins that he can use to pay her. What is the difference between the largest and the smallest number of coins he can use to pay her?
Problem 3
Isabella had a week to read a book for a school assignment. She read an average of 36 pages per day for the first three days and an average of 44 pages per day for the next three days. She then finished the book by reading 10 pages on the last day. How many pages were in the book?
Problem 4
The sum of two prime numbers is 85. What is the product of these two prime numbers?
Problem 5
Margie's car can go 32 miles on a gallon of gas, and gas currently costs $4 per gallon. How many miles can Margie drive on $20 worth of gas?
Problem 6
Six rectangles each with a common base width of 2 have lengths of 1, 4, 9, 16, 25, and 36. What is the sum of the areas of the six rectangles?
Problem 7
There are four more girls than boys in Ms. Raub's class of 28 students. What is the ratio of number of girls to the number of boys in her class?
Problem 8
Eleven members of the Middle School Math Club each paid the same amount for a guest speaker to talk about problem solving at their math club meeting. They paid their guest speaker $. What is the missing digit A of this 3-digit number?
Problem 9
In , is a point on side such that and measures . What is the degree measure of ?
Problem 10
The first AMC 8 was given in 1985 and it has been given annually since that time. Samantha turned 12 years old the year that she took the seventh AMC 8. In what year was Samantha born?
Problem 11
Problem 12
Problem 13
Problem 14
Problem 15
Problem 16
Problem 17
Problem 18
Problem 19
Problem 20
Problem 21
Problem 22
Problem 23
Problem 24
Problem 25
Solution The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.