Tom drinks 8 oz of water for every 3 miles he bikes. After 21 miles, how
much water did he drink?

56 oz

Step-by-step explanation:

He stops 7 times in 21 miles because he stops every 3 miles and 21 divided by 3 equals 7. He  also drinks 8 oz of water every time he stops, and if he stops 7 times then we just multiply 8 and 7, and since 8×7=56 he drank 56 oz of water after 21 miles.

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c