please HELP
im preparing for my math exam tomorrow and i need help solving these types of questions I will give you brainliest and 5 stars and heart please help I was always bad at these types of questions

The length of a ribbon roll is 2.5 m. If 50 cm has been used from it, how much is left?

Answers

Answer 1
1 meter = 100 centimeters
2.5 meters = 250 cm
If you use 50 cm, then you have
2 meters or 200 cm left
Answer 2

Answer:

200 cm (or 2 meters) or 80% of the original 250 cm is left.  let me know if you have any questions.  

Step-by-step explanation:

I'm not sure if that's asking for an exact amount or percent, so I will do both.

The trick either way is to match units.  we have meters and centimeters.  You could make either one match the other.  so 2.5 m is 250 cm and 50 cm is .5 m.

You do have to know how many centimeters is in a meter, but once you know that you can set up unit conversions, which are super simple.

there are 100 cm in a m.  a unit conversion is basically a fraction that cancels out units.  starting with 2.5 m we want to cancel out m so the fraction we use has the m part in the denominator.  so 2.5m * (100 cm)/(1 m).  (100 cm)/(1 m) is the unit conversion, and just like variables the m in the denominator cancles out the m in the starting value so it turns into 2.5 * 100 cm/1 = 250 cm.

similarly to go from 50 cm to meters you make the unit conversion have cm in the denominator.  so 50 cm * (1 m)/(100 cm) = .5 m.  again, the cm int he denominator cancels out the cm in the unit being multiplied.  Let me knwo if this is still not clear.

Anyway, now we have the numbers we need.  let's make them all cm, I think using the smallest unit is usually easiest.  so that's 250 cm total and 50 cm used.

In pure numbers, that means 200 cm is left (which is 2 meters) after 50 cm gets used.

percents is a little trickier.  if 250 is 100% then 50 is 20%, which you can get by doing 50/250.  if you do not know, a fraction a/b gives you the percent a is of b.  Or rather it gives you a decimal, and if you multiply it by 100 it gives you the percent.

anyway, if 20% is used then 80% is left.  if you did 200/250 you would get that.


Related Questions

WHICH IS AN IRRATIONAL NUMBER?
BRAINLYIST!!

Answers

Answer:

The first one

Step-by-step explanation:

The second one is 0.

The third one is rational, just 0.6.

The last one is just the absolute value, which is 3.

Answer: C or D

Step-by-step explanation:

Work out the value of x
2x + 13
x-4
x+7
(Look at the photo attached)

Answers

Answer:

x = 41

Step-by-step explanation:

The sum of the 3 angles in a triangle = 180°

Sum the 3 given angles and equate to 180

2x + 13 + x - 4 + x + 7 = 180, that is

4x + 16 = 180 ( subtract 16 from both sides )

4x = 164 ( divide both sides by 4 )

x = 41

Answer:

x=41

Step-by-step explanation:

we know that all the angles need to add up to 180

The angle on top is almost a right angle(90) but is not exactly

playing with the numbers will help

95-13=82/2=41

lets continue with this and see if it works out

41+7=48

41-4=37

48+95+37=180

hope this helps!

I need help with this problem please.

Answers

Answer:

1725ft^2

Step-by-step explanation:

Area of trapezoid:

[tex]\frac{b_1+b_2}{2}*h[/tex]

Substitute the values and solve:

[tex]\frac{50+65}{2}*30=1725[/tex]ft^2

Answer:

1725 sq.ft

Step-by-step explanation:

Given

Parallel sides of the trapeziod yard = 50ft , 65ft

Height of the trapezoid = 30ft

Therefore, area of the trapezoid yard

[tex] = \frac{b1 + b2}{2} \times h[/tex]

[tex] = \frac{50ft + 65ft}{2} \times 30ft[/tex]

[tex] = \frac{115ft}{2} \times 30ft[/tex]

= 57.5 ft × 30 ft

[tex] = 1725 {ft}^{2} (ans)[/tex]

Alexa invested 54000 in an account paying an interest rate of 4% compounded continously . Assuming no deposits or withdrawals are mad, how long would it take, to the nearest year., for the value of the account to reach 106, 200

Answers

Answer:

17

Step-by-step explanation:

Can you guys help me

Answers

Answer: the top is 4 and the | is 4 too. The other __ is 8 because 12 - 4 is 8. And the final | is 4 because it’s 8/2

Step-by-step explanation:

Is this correct???????

Answers

Yes it is correct!! Hope it helps

SOMEBODY HELP PLEASEEE I DONT KNOW WHY THIS IS SUPPOSED TO BE 20+ CHARACTERS LONG BUT HERE IT IS

Answers

Answer:

20h + 20

Step-by-step explanation:

5(2h + 4) + 10h

1️⃣ Expand by distributing terms.

10h + 20 + 10h

2️⃣ Collect like terms.

(10h + 10h) + 20

3️⃣ Simplify.

20h + 20

Answer: 20h + 20

Done ✔

the answer is 20h+20

(PLEASE HELP) What is the value of x?

Enter your answer in the box.

x =

Answers

Answer:

x = 12

Step-by-step explanation:

(10x - 20)° + (6x + 8)°= 180°

(Linear pair angles)

(10x - 20 + 6x + 8)°= 180°

(16x - 12)°= 180°

16x - 12 = 180

16x = 180 + 12

16x = 192

x = 192/16

x = 12

Answer:

so x would equal 12

Step-by-step explanation:

(10x - 20)° + (6x + 8)°= 180°

so you are going to want to combine like terms which would be

10x and 6x, and 20,8

10x+6x=16x

20-8=12

16x-12=180

now you want to get 12 on the opposite side of the equal side so you add (since it is negative) 12 to each side

which gets rid of the first 12

16x=180+12

now you can add 180+12

and you get 192

so now we want to get x by itself in order to do that you must divide

you are going to divide by 16 an each side and the 16 cancels out the first 16

16x/16=192/16

x=192/16

and 192 divided by 16 is 12

so you answer is

x=12

Hope this made sense :)

find the value of x
93
109
46

Answers

Answer:

109 °

Step-by-step explanation:

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akqnajjsjajqjajqjwjwwujwjsw akqnajjsjajqjajqjwjwwujwjsw

akkaskakk akqnajjsjajqjajqjwjwwujwjsw snsjjjaja la snsnjJaan

smsnsnsnsnskskksksakksksksksjsjsjsjsksksbnnjbnjjj

Answer:

i think it's 68 because all the angle have to add up to 180 degrees and if you add

68+93+109+46

you will get 180

Explain why it is important to write equivalent fractions before remaining.

Answers

Answer:

hope it helps the answer

What are the factors of a(3+ y)

Answers

Answer:

2 factors.

Step-by-step explanation:

A factor is something which is multiplied by something else. (It can be a variable, number or term).

In this example, there are 2 factors: a & (3+y).

Hope this helps! Have a great day!

Your Question:
a(3+y)
Rearrange terms:
(3+)(+3)
Distribute:
a(y+3)
ay+3a
Solution:
ay+3a

-picture attached. A coke is formed from a paper circle with a sector removed as shown. the radius of the paper circle is 40cm The angle AOB is 110° calculate the circumference of the base of the cone.

Answers

yes all u do is u look at it can read it the most one that makes since u add

In AABC, what is the measure of angle B?
B
(2x)
(x + 2)
140°
A
с
O 46°
O 489
O 70°
O 920

Answers

Answer:

92°

Step-by-step explanation:

∠C=180-140=40

∠A+∠B+∠C=180

40+2X+X+2=180

X=46

∠B=46*2=92°

Answer: 92 degrees

Step-by-step explanation:

The exterior angle measuring 140 is equal to the sum of the two remote interior angles.

(X+2) + (2x) = 140. Combine like terms.

2 + 3x = 140. Subtract 2 from both sides.

3x = 138. Divide both sides by 3.

X = 46

Angle b = 2x. Substitute 46 in for x.

Angle b = 2(46)

Angle b = 92

GIVING BRAINIEST IF RIGHT!! ANSWER FAST PLEASE

The table below shows the distance covered by a train over time.
Do the numbers in the table represent a proportional relationship? Why or why not?

A. No, because the ratios simplify to the same number.
B. Yes, because the ratios simplify to the same number.
C. No, because the ratios don't simplify to the same number.
D. Yes, because the ratios don't simplify to the same number.

Answers

Answer:

I think its B.) Yes, because the ratios simplify to the same number., sorry if it's wrong

Step-by-step explanation:

50/10 = 1/5

60/12 = 1/5

70/14 = 1/5

80/16 = 1/5

They all simplify to the same proportion.

1. (10 points) Explain how to factor the following:
A: 3m2 + 4m +1 = 0
B: 16n- 25
C: 20n3 - 15n2 + 4n - 3
D: 864.3 + 4

Answers

Answer:

A. 3m² + 4m + 1 = 0

3m² + 3m + m + 1 = 0

3m (m + 1) + 1 (m + 1) = 0

( 3m + 1 ) (m + 1) = 0

B. 16n - 25

16n = 25

n = 25/16

are these triangles congruent ?

Answers

Answer:

SAS congruence criteria

Step-by-step explanation:

There are two sets of congruent sides and an included verticle angle, so they are congruent

need help solving bu completing square ​

Answers

Answer:

9 +/- 13 or

22 or -4

Step-by-step explanation:

5x^2 - 90x - 475 = -35

5x^2 - 90x - 440 = 0

plug into quadratic formula

Which of these expressions is equivalent to log (92)? O A. log (2) • log (9) O B. log (2) – log (9) OC. log (2) + log (9) OD. 2 • log (9)​

Answers

Correct question is;

Which of these expressions is equivalent to log (9^2)?

Answer:

D: 2•log 9

Step-by-step explanation:

From log rules, we know that;

log(a^n) = n•log(a)

Applying that rule to this question, we can simplify log (9^2) as;

log (9^2) = 2•log 9

Looking at the options, the correct one is Option D

a. Convert 39/7 to a mixed number
b. Covert 56/123 to a decimal.
Give your answer to 2 decimal places

Please help me asap

Answers

The answer to this question is A). 39 b). 56

(2x + 4) + (-7 - 3b) + (5 - 8x)
)
Please help

Answers

Answer:

Step-by-step explanation:

First, open the brackets.

(2x + 4) + (-7 - 3b) + (5 - 8x)

= 2x + 4 -7 - 3b + 5 -8x

Simplify the like terms.

= 2x - 8x - 3b + 4 -7 + 5

= -6x - 3b + 2

solve the system of equations by graphing then write the solution y=2x -6 HELP I HAVE 10 MINUTES TO FINISH ILL GIVE 40 POINTSSSS

Answers

Step-by-step explanation:

Graph: y=−2x is a linear equation in slope-intercept form: ... The x-intercept is the value of x when y=0 , and the y-intercept is the value of y when x=0 .

Hope this helps! Have a great day!

Larry makes sandwiches for lunch every day. He can make 6 sandwiches with every 3 tomatoes he buys. If he bought 9 tomatoes, how many sandwiches could he make?A.162
B. 9
C. 54
D. 18

Answers

Answer - 18 ..

Explanation :

Answer:D 18

Step-by-step explanation:you take 6 and times it by three

if there 5 people and 50 wing how many do everybody get in number

Answers

Answer:

then its answer is 10

Step-by-step explanation:

if there are 50 wings and 5 people then multiplying 5 into 10 is 50

10. What is the solution to the proportion?
3
7
42

Answers

Answer: w=18

Explanation: 7×6 = 42 so to get W you have to multiply 3 by 6. 3×6 = 18.
W=18 because to get 4070 to multiply 7 by 6 so then to get your numerator you then multiply the 3 by 6

the line on the graph passes through the points A (0, 6) and B (3, 0)

Answers

Answer:

a) -2

b) ½

c) y= ½x +6

Step-by-step explanation:

Please see the attached pictures for the full solution.

It costs $525 for seven adult tickets and twelve youth tickets to the hockey game. If the difference in price between an adult ticket and a youth ticket is $18.00, find the cost of each kind of ticket.​

Answers

Answer:

adult ticket $39 and youth ticket $21

Hope it helped

PLS mark BRAINLIEST

11.3 x 3 = 28.25 please show the formula​

Answers

65.98 because of it I have no clue how much you want me and you to get me some of my stuff I need you I know I have a good idea of that but I’m still in a little while

Plz help due tomorrow

Answers

Answer:

-16

Step-by-step explanation:

you need to distribute the 2 to the (-8) :D

Answer:

-8x + (-16) = 24

Step-by-step explanation:

-8(x + 2) = 24

-8*x and -8*2

-8x + (-16) = 24

Just in case you need to solve:

-8x = 40

x = -5

A builder needs 9,438 nails to finish a project. If the nails come in packages of 66, how many packages should the builder purchase? ​

Answers

Answer: 143 packages

Step-by-step explanation: You divide 9,438 by 66

a polynomial contains number of terms

Answers

It contains 2 numbers of terms
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