Use gcf and the distributive property to write equivalent expressions in factored form for the following expressions.
a. 4d + 12e
b. 18x + 30y
c. 21a +28y
d. 24f + 56g

What is the ratio for the surface areas of rectangle prisims shown below given that they are similar and that the ratio of their edge lengths is 7: 3

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.