15 points and brainliest the mass of 4.5 cm3 of iron and 8 cm3 of copper is equal to 101.5g. the mass of 3 cm3 of iron is 6.8g greater than the mass of 2 cm3 of copper. find the density of iron and the density of copper. technological advances in farming made it possible to increase the crop of potatoes from 1 acre by 4 tons. as a result, from a field of 320 acres 640 tons of potatoes more were collected than before from a field of 400 acres. how many tons of potatoes were collected before the new methods and how many after the introduction of the new technology? i am having trouble with both questions. with both!

density of iron is 7.8g/cm cubed

density of copper is 8.3g/cm cubed

Step-by-step explanation:

density =mass/volume

the answer is ! ?

required rate of return = 0.166 = 16.6%

step-by-step explanation:

under the capital asset pricing model (capm), the required or expected rate of return for a particular security or asset is given using the formula:

required rate of return = risk-free rate + beta*(market risk premium)

we are given that;

risk-free rate = 4% = 0.04

beta = 1.4

market risk premium = 9% = 0.09

we simply plug these values into the above formula;

required rate of return = 0.04 + 1.4*(0.09)

required rate of return = 0.04 + 0.126

required rate of return = 0.166 = 16.6%