Sacha spent
of his time in study hall on science homework and
of his time on math homework. which expression
can be used to determine how much more of the time in study hall sacha spent on math than on science?
o 0.58 -0.28
o 0.058 -0.028
0.625 - 0.25
0.625 -0.025

Sacha spent Two-eighths of his time in study hall on science homework and Five-eighths of his time on math homework. Which expression can be used to determine how much more of the time in study hall Sacha spent on math than on science?

The expression can be used to determine how much more of the time in study hall Sacha spent on math than on science is 0.625t - 0.25t or 0.375t

Let "t" be the total time spent on homework(science + math)

Given that Sacha spent Two-eighths of his time in study hall on science homework

Time spent on science homework = Two-eighths of his time

Five-eighths of his time on math homework

Time spent on maths homework = Five-eighths of his time

To find how much more time Sacha spent on maths than science, we have to find the difference between time spent on math and time spent on science

Time spent on maths than science = Time spent on maths homework - Time spent on sceince homework

Thus the expression can be used to determine how much more of the time in study hall Sacha spent on math than on science is 0.625t - 0.25t or 0.375t

"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

step-by-step explanation:

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1