$x^2+6x-7=0 \\ a=1 \\ b= 6 \\ c=-7 \\ \\ \boxed{\boxed{\Delta=b^2-4ac}} \\ \\ \Delta=6^2-4*1*(-7) \\ \Delta=36-(-28) \\ \Delta=64 \\ \Delta\ \textgreater \ 0 \Rightarrow \text{we have 2 solutions :} X_1 \ and X_2 \\ \\ \boxed{X_1= \frac{-b- \sqrt{\Delta} }{2a} } \Rightarrow X_1= \frac{-6-8}{2}=-7 \\ \\ \boxed{X_2= \frac{-b+ \sqrt{\Delta} }{2a} } \Rightarrow X_2= \frac{-6+8}{2} =1$

4 0

3 years ago

The table shows the distance Allison drove one day of her vacation. Is the relationship between the distance and the time propor

miv72 [106K]

Answer:

hope that it helps you any

Step-by-step explanation:

first hour she drove 60mi

second hour she drove 50mi

third hour she drove 70mi

fourth hour she drove 20mi

fifth hour she drove 75mi

all together she drove 275miles

take 275 divide it by 5 you get an average of 55mph

7 0

3 years ago