3. A pharmacist needs a blend of chemical containing 35% of manganese but she has one vial at 40% and another at 25%. How many of each must be mixed to provide 100 pounds of
35% manganese?

i dont know it

step-by-step explanation:

34.5 cm

step-by-step explanation:

generally for a circular segment of angle, θ° and radius r

arc length

= (θ/360) x circumference

= (θ/360) x 2πr

in our case, θ = 60°, π=3.142 and r = 33 cm

substitute into above formula

arc length

= (60/360) x 2(3.142)( 33) = 34.5 cm