Answer:

first one is 432

Step-by-step explanation:took the test and got it right

let

x-------> walnuts that Mario eats in a week

y-------> walnuts that Yolanda eats in a week

we know that

x=2y-------> equation 1

y=6*7-------> y=42 walnuts

substitute the value of y in equation 1

so

x=2*42-----> x=84 walnuts

therefore

the answer is

Mario eat in a week 84 walnuts

Just search this up on the internet

I think option C is correct answer because we drawn bars on histogram by touching each other or not ,it makes no difference

It's definitely D.