Mary lou has 2 more nickels than pennies, and she has 30 coins all together. use x for the number of pennies.
a) 2(x + 2) = 30
b) x + (x + 2) = 30
c) 2x + 30 = 5
d) x + 2 = 30

Acompany is testing in comparing to lightbulb designs the box plot shows the number of hours that each lightbulb design last before burning out which statement is best supported by the information of the plot

How do i do this activity, is appreciated

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.