Subtract using a number line. −2.3−(−0.4)

Plot the minuend and the difference on the number line.

Find the value of x. round the length to the nearest tenth

The graph and table shows the relationship between y, the number of words jean has typed for her essay and x, the number of minutes she has been typing on the computer. according to the line of best fit, about how many words will jean have typed when she completes 60 minutes of typing? 2,500 2,750 3,000 3,250

Having a hard time understanding this question (see attachment).