Okay so what you want to do it's multiply the 7 by 870 which gives you the answer you were given above but remember problems like these you need to multiply and make sure to label your units MY teachers used to tell me no naked number so make sure everything is labeled and I hope you can understand what I'm saying because I know it might be hard but I'm just a Stanley trying to help so idk I'm kinda going crazy and yapping about myself so why don't I just tell u my whole life story I grew up in a house lol jk well I hoped this helped bye
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