10 red marbles
Multiply the # of blue marbles by 2 (since there was TWICE as many red marbles), and you have your answer (above)
Direct variation is y=kx, so you have to put those numbers and find the constant. Once you have done that, use the other number to find the answer
The factors of 42 are: 1,2,3,6,7,14,21,42
No, 12 is the wrong answer. 5 is correct
This is because since a and c are congruent that means y=52. And we already know that every triangle adds up to 180 degrees so, you add A and C and get 104 (52+52).
And 180-104=76 so, 14x+6 must =76.
14(5)=70+6=76. 76+104=180, therefore, x=5.