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Lady bird [3.3K]
3 years ago
14

I have to use mental math to solve everything and I'm only in 5th grade and I confused ‍♀️ also I don know what to do

Mathematics
2 answers:
Keith_Richards [23]3 years ago
5 0

Answer:

can you type the question? my chromebook wont show me the link

Step-by-step explanation:

kenny6666 [7]3 years ago
3 0

Answer:

B: 287

D: 300

Step-by-step explanation:

D

d is certainly a lot easier than b.  Start by understanding that 12 = 6 + 6 which you should be able to handle in your head.

6 * 25 + 6*25

150 + 150

300

This is a prized skill. You should practice it all the time. It leads to estimation which is something you should try to do in any math class you take.

B

How about 10 twenty-sixes + 1 twenty-six. Let's see how that works out.

10* 26 + 26

260 + 26

286   You should check to see if that works. Notice that the 2 and the 6 add to 8 which is what they should do if you are multiplying by 11. The end numbers add to the middle one for 3 digits. It get's a little messy when the end two number add to something greater than 10, but that's another story.


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mel-nik [20]

Answer:

20%

Step-by-step explanation:

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Multiply and simplify. (x + 3)(x - 8)
Kazeer [188]

Answer:

x^{2} - 5x - 24

Step-by-step explanation:

( x + 3 )( x - 8 ) =

x^{2} - 8x + 3x - 24 = x^{2} - 5x -24

4 0
3 years ago
Q and R are independent events. If P(Q)= 1/8 and P(R)=2/5 find P(Q and R).
Dafna11 [192]
Answer: 1/20
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3 0
3 years ago
Maria has 3 ceramic cats. She plans to buy some more. Write an equation in the form of y = x + b, b≠ 0 (b is not equal to 0) tha
Snezhnost [94]

Answer: y = 3+b

Step-by-step explanation:

Hi, to answer this question we have to write an equation:

y = x + b

Where:

y = total number of ceramic cats

x = actual number of ceramic cats

b=new ceramic cats bought

Replacing with the value given:

y = 3+b

Where y is the dependant variable and b the independent variable.

Feel free to ask for more if needed or if you did not understand something.

5 0
3 years ago
In a particular country, there are two types of currency: Kabuls and Carumpts. 8 Kabuls and 2 Carumpts are worth $61.70. 3 Kabul
Misha Larkins [42]

Answer:

Kabuls = 7.5

Carumpts= 0.85

Step-by-step explanation:

Let x represent the price of kabuls

Let y represent the price of carumpts

8x + 2y= 61.70......equation 1

3x + 10y= 31.........equation 2

Multiply equation 1 by 3 and equation 2 by 8

24x + 6y= 185.1

24x + 80y= 248

-74y = -62.9

y= 62.9/74

y= 0.85

Substitute 0.85 for y in equation 1

8x + 2(0.85) = 61.70

8x + 1.7= 61.70

8x = 61.70-1.7

8x = 60

x= 60/8

x= 7.5

Hence the dollar value for kabuls is 7.5 and carumpts is 0.85

3 0
2 years ago
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