An engineer is investigating ways to improve gas mileage. his initial hypothesis is, "if we use higher octane gasoline, then the gas mileage will increase." what should his control group be? a) the type of car used in the testb) using higher octane gasolinec) the gas mileage of the test vehiclesd) some cars using regular octane gasoline

The correct option is D

Explanation:

In proposing the hypothesis, the objective is to demonstrate that increasing the octane rating of the gasoline will increase the mileage it performs. There are two types of groups when carrying out this type of study. The experimental group to which the change proposed by the hypothesis is applied. And the control group, which is the one with which the hypothesis is contrasted, in these the tested factor is not applied.

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what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer