MATHEMATICS
HIGH SCHOOL

Answer: This is a Cosine rule question. Apply this, and you should find the answer.

HIGH SCHOOL

5x + 5 – 3x = 14 – 2x + 7 + 8x

5x-3x+2x-8x=-5+14+7

-4x=16

x=-4

-4x=16

x=-4

5x+5-3x=14-2x+7+8x -8x -8x ------------------------------ -3x+5-3x=14-2x+7 -5 -5 ------------------------------- -3x-3x=14-2x+2 -6x=16-2x ---------------------- -6x=16-2x +2x +2x ---------------------- -4x=16 --- --- -4 -4 x= -4

HIGH SCHOOL

a train leave a station traveling north at 50km/hr. 3 hours later a second train leaves on parrallel tracks travels north at 90km/hr. how far from the station will they meet?

-- The first train leaves the station,going 50km/hr.

-- 3 hours later, when the 2nd train starts out, the first train

has covered (3 x50) = 150 km.

-- When they're both moving, the 2nd train gains (90 - 50) = 40km

on the first train each hour.

-- The second train gains the 150km that he was behind, and overtakes

the first train, in (150 / 40) = 3.75 hours .

-- In that 3.75 hours, the second train has covered (3.75 x 90) = 337.5km ,

and that's the distance from the station to the place where they 'meet'.

MIDDLE SCHOOL

Which unit rate is the lowest price per ounce? Choice A: 5 ounces of raisins for $1.49

Choice B: 12 ounces of raisins for $3.59

A. Choice B

B. The unit rates cannot be determined.

Answer:

Choice A

Step-by-step explanation:

A. 1.49/5 = 0.298

B. 3.59/12 = 0.299

In conclusion, "A" is the lowest price by 1 cent.

Hope this helps :-)

MIDDLE SCHOOL

Out of 72 problems assigned last week for RSM homework, Sam solved correctly 63 problems. What is his score for this homework?

We know that out of 72 problems assigned last week for RSM homework, Sam solved correctly 63 problems.

To find the percent we have to divide correct answers by total problems and then multiply by 100.

63 / 72 * 100 = 87.5%

To find the percent we have to divide correct answers by total problems and then multiply by 100.

63 / 72 * 100 = 87.5%

63/72 = 0.875

He scored 88%, or a B+

He scored 88%, or a B+