I’m currently attempting the project for the Data Frames lesson in R. The directions are making sense to me, and I felt I was coding correctly and can’t find my error.

For Task 4, I got this error message: " ```

Error in select(-normalized_losses): object ‘normalized_losses’ not found

```
For Task 6, i got this error message: " ```
Error in rename(risk_factor = symboling): object 'symboling' not found
```

For Task 8, I got this error message: " ```

Error in mutate(mpg_diff_from_threshold = highway_mpg - mpg_threshold): object ‘highway_mpg’ not found

I am extremely new to coding! I have attached my code below, and here is a link to the project page: [https://www.codecademy.com/courses/learn-r/projects/1985-cars-r-project]

I am sure I am just making a simple mistake, but I’m so stuck!

```
---
title: "1985 Cars"
output: html-notebook
---
# Task 1
```{r message=FALSE, warning=FALSE, error=TRUE}
# load libraries
library(readr)
library(dplyr)
```

# Task 2

```
# load data
cars <- read_csv('cars85.csv')
```

# Task 3

```
# inspect data
head(cars)
summary(cars)
```

# Task 4

```
# select columns
cars %>%
cars <- select(-normalized_losses)
```

# Task 5

```
# view columns
colnames(cars)
```

# Task 6

```
# rename column
cars %>%
cars <- rename(risk_factor = symboling)
colnames(cars)
```

# Task 7

```
# define threshold
mpg_threshold <- 30
```

# Task 8

```
# add column
cars %>%
cars <- mutate(mpg_diff_from_threshold = highway_mpg - mpg_threshold)
head(cars)
```