Estimate square root of21

Can someone answer it, and plot it, for 20 points and brainliest answer? p. s. they're the same ! : )

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.