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serious [3.7K]
3 years ago
6

A rectangular piece of paper measuring 25cm by 21cm is

Mathematics
2 answers:
timurjin [86]3 years ago
6 0
The surface area is the area of the rectangle - it has been rolled so no different.

25 x 21 = 525 cm^2
kvasek [131]3 years ago
4 0

The area of the piece of paper is (25cm x 21cm) =  525 cm² .

There's no reason it should change when you bend the paper
into different shapes.
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One number exceeds another by 18 and their sum is 36.
AnnZ [28]

x - first number

x + 18 - second number

x + (x + 18) = 36

x + x + 18 = 36

2x + 18 = 36        | - 18

2x = 18           | : 2

x = 9

First number: x = 9

Second number: x + 18 = 9 + 18 = 27

Those numbers are 9 and 27.

3 0
3 years ago
A rock is dropped from a height of 100 feet. Calculate the time between when the rock was dropped and when it landed. If we choo
Fiesta28 [93]

Answer:

A

Step-by-step explanation:

the rock lands when it reaches height 0.

so, for what t is h(t) = 0 ?

16t² - 100 = 0

16t² = 100

now we pull the square root on both sides (we can ignore the negative solutions, as negative seconds don't make any sense in our scenario)

4t = 10

t = 10/4 = 5/2 = 2.5 seconds

so, A is correct.

6 0
2 years ago
6 Silas lost 11 pounds in a year after joining the basketball team and now
Rudik [331]

Answer:

8:9

Step-by-step explanation: Add 88+11 to get his weight before=99 Pounds. Then you put together the ratio. 88:99.

The GCF for those numbers would be 11, so divide them both by 11, to get a final answer of 8:9

4 0
2 years ago
If the spinner is spun once, then P (landing on test postponed) is...
Scrat [10]

Answer:A

Step-by-step explanation:

5 0
2 years ago
Which graph represents the equation -5x+4y>-1?
galben [10]
<h3>Answer: Choice D</h3>

======================================================

Explanation:

The inequality sign has an "or equal to", which means the boundary line will be solid. We can rule out choices B and C because they have dashed boundary lines.

A solid boundary line means that points on the boundary are part of the solution set.

Now let's see what happens when we plug in a point like (x,y) = (4,0). This will tell us how to shade the blue region.

-5x + 4y \ge -1 \\\\-5(4) + 4(0) \ge -1 \\\\-20 \ge -1 \\\\

This is false because -20 is not larger than -1. It's the other way around.

This tells us the point (4,0) is not in the blue shaded region, and it's not on the boundary line either. We can rule out choice A because of this.

The only thing left is choice D, which is the final answer. I recommend plugging a point from this region into the inequality to confirm we have a true statement.

6 0
3 years ago
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