Paul bought a soft drink and a sandwich for $9.90. what equation may be used to find the price of each item if the sandwich cost 3.5 times as much as the soft drink? a) x = 9.90 b) 2x = 9.90 c) 3.5x = 9.90 eliminate d) 3.5x + x = 9.90

D

Step-by-step explanation:

The other ones don't make sense. The answer is 3.5x+x=9.90

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.