MATHEMATICS MIDDLE SCHOOL

Lúcia is using energy at a rate of 420 kilocalories (kcal) per hour (h) ice skating.At what rate is Lúcia using energy in calories per minute (cal/min)?

Answers

Answer 1
Answer:

Answer:

7,000 calories or 7 kilo cal/min.

Step-by-step explanation:

Lucia is using energy at a rate of 420 kilo calories per hour ice skating.

1 kilo calories = 1000 calories

420 kilo calories = 420,000 calories

1 hour = 60 minutes

∵  Lucia is using energy per 60 minutes =  420,000 calories

∴ She is using energy per minute = (420,000)/(60)

                                                       = 7,000 calories or 7 kilo calories

Lucia is using energy 7,000 calories/minute.
Answer 2
Answer: 420000 calories is 60 mins so 420000/60= 7000/min I think :)

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10 points 4 correct answer asap
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Y varies directly as x. if x=5 when y=12 find x when y=30
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A circular skating rink has a radius of 40 feet. Which expression can be used to find the circumference of the skating rink, in feet?

The height (h metres) and age (a years) of a tree are related by the following inequality:
h < 4a – 3 for values of a between 1 and 10
Which pair of values satisfy this inequality?
a. h = 2 and a = 1
b. h = 6 and a = 2
c. h = 10 and a = 3
d. h = 20 and a = 6

Answers

h < 4a – 3
(2) < 4(1) - 3
2 < 4 - 3
2 < 1
Not True

h < 4a – 3
(6) < 4(2) - 3
6 < 8 - 3 
6 < 5
Not True

h < 4a – 3
(10) < 4(3) - 3
10 < 12 - 3
10 < 9
Not True

h < 4a – 3
(20) < 4(6) - 3
20 < 24 - 3
20 < 21
True

Answer: (d) h = 20 and a = 6

33 POINTS POSSIBLE PLEASEEEE HELP b) How many moles of Na2O are required to produce 1.60 x 1024 molecules of NaOH?


Given the following equation: 8 Fe + S8 → 8 FeS
a) What mass of iron is needed to react with 16.0 moles of sulfur?

Answers

Answer:

7148.16 grams of iron

Step-by-step explanation:

If you have 16 moles of S8, you have 16*8 moles of iron at 55.845 g/mol Iron. 16*8mol*55.845 g/mol leads moles to cancel and leaves you at 7148.16 grams of iron

How many presedents do we have in the united states of america

Answers

To answer your question very literally, the united states only elects one president per term! The president can only serve two terms and is then forced to leave office! But if you where asking how many presidents the U.S. has had, as of 2016 the U.S. has had exactly 43 presidents and 44 presidencies (one served a second term)
44 is the number of presidents we have had in the united states

chris and lisa went shopping and spent a total of $25.50. lisa spent $13.50 more than what chris spent. How much did Lisa spend

Answers

$25.50-$12.00=$13.50 

Lisa spent $13.50
Lisa spent 13.50 all together

55.8 ÷ (-3.1) do i estimate

Answers

Answer:

The answer is -18

Step-by-step explanation:

A box contains twenty-five cards numbered 1 through 25. One card is to be randomly drawn from the box. What is the probability that the card drawn will show a multiple of 5, a multiple of 6, or a multiple of 7?

A.12/25


B.9/25


C.3/25


D.1/25

Answers

Multiples of 5 less than 25:  5,10,15,20,25
Multiples of 6 less than 25:  6,12,18,24
Multiples of 7 less than 25:  7,14,21
12 of the numbers are multiples of 5,6, or 7.  Your probability is 12/25
D because there is only one of each so you can only pick one of that card unless you put the card back in
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A window washer uses the proportional relationship y = kx to determine how long (y) it will take him to wash any number of windows (x). It takes the window washer 8 hours to wash 250 windows. What is the value of kA) k = 242 B) k = 258 C) k = 0.032 D) k = 31.25
If you have 3 tons of milk how many cups are there and then divide by 5
A soccer game is 90 min long.36 min have passed what percentage of the game has passed?
Val walks 2 3/5 miles each day. bill runs 10 miles once every 4 day. in 4 days who covers the greater distance