*Two circles are externally tangent at point A. Line t is tangent to the circles at point B and C. Prove that m∠BAC=90°.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Parks is wearing several rubber bracelets one third of the bracelets are tie dye 1/6 are blue and 1/3 of the remainder are camouflage if park swears to camouflage bracelets how many bracelets does he have on

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?