# Math

what does x reduce to????

6x=15(mod 21)
2x=5(mod 7)

x= ?(mod)7

1. 👍 0
2. 👎 0
3. 👁 134
1. see solution below

1. 👍 0
2. 👎 0

## Similar Questions

1. ### solving trig. equations

tan(3x) + 1 = sec(3x) Thanks, pretend 3x equals x so tanx + 1 = secx we know the law that 1 + tanx = secx so tanx + 1 becomes secx and... secx = secx sec(3x) = sec(3x) [just put 3x back in for x- you don't really have to change 3x

asked by Jen on April 12, 2007
2. ### Math

Find all numbers \$r\$ for which the system of congruences: x == r mod 6 x == 9 mod 20 x == 4 mod 45 has a solution.

asked by Anonymous on September 30, 2016
3. ### Math (Proof)

Prove that if ab = ac (mod n) and a is relatively prime to n, then b = c (mod n). Proof: a and n are relatively prime and from ab = ac(mod n), we have n|(ab-ac), so n|a(b-c). Since (a,n)=1 (relatively prime), we get n(b-c). hence

asked by Michael on February 14, 2013
4. ### Math

Solve X=8(mod 11), X=9(mod 12), X=10(mod 13)

asked by Morris on December 2, 2010
1. ### math

FIND THE MODULO CLASS TO WHICH THE NUMBER BELONGS FOR THE GIVEN MODULO SYSTEM 53 mod 12

asked by nichole on June 12, 2011
2. ### math

Which Statements of congruence are true and which are false and why? 177 _= 17 (mod 8) 871 _= 713 (mod 29) 1322 _= 5294 (mod 12) 5141 _= 8353 (mod 11) 13944 _= 8919 (mod 13) 67 x 73 _= 1 x 3 (mod 5) 17 x 18 x 19 x 20 _= 4! (mod 8)

asked by Jimmy on October 24, 2012
3. ### Math

Prove that a^3 ≡ a (mod 3) for every positive integer a. What I did: Assume a^3 ≡ a (mod 3) is true for every positive integer a. Then 3a^3 ≡ 3a (mod 3). (3a^3 - 3a)/3 = k, where k is an integer a^3 - a = k Therefore, a^3

asked by Kid on November 14, 2018
4. ### number theory

give an example to show that a^2 congruent to b^2 mod n need not imply that a congruent to b mod n.

asked by Laura on April 18, 2009
1. ### college math

what is the remainder when the sum 1^5+2^5+3^5+...99^5+100^5 is divided by 4? again a mod problem that I don't know how to work.

asked by Laura on April 19, 2009
2. ### Discrete Math

Congruence True or False: (give reason) _ __ 2 ∈ 18 (mod 8) Can someone please help with this problem? I'm confused. . . Thanks for any helpful replies.

asked by Francesca on March 14, 2011
3. ### Quantum Physics

In this problem, we will carry out some steps of the quantum factoring algorithm for N = 15 (a) What is the period k of the periodic superposition set up by the quantum factoring algorithm if it chooses x = 2 ? (b) Assume that we

asked by Gyanno on March 21, 2013
4. ### Health

________ physical activity and ________ time spent in sedentary behaviors. A. Increase; increase B. Reduce; increase C. Increase; reduce D. Reduce; reduce I got C.

asked by Dalton on March 17, 2015