MATHEMATICS MIDDLE SCHOOL

12a+9b=k (2a+3/2b) Which value of k makes the equation true?

1) 6
2) 2
3) 3
4) 4

Answers

Answer 1
Answer:

12a+9b=k (2a+3/2b)

Which value of k makes the equation true?

1) 6
Answer 2
Answer:

Answer: \n 12a + 9b = k(2a + (3)/(2) b) \n \Leftrightarrow 6(2a + (3)/(2) b) = k(2a + (3)/(2) b) \n \Leftrightarrow k = 6 \n

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What are the first five multiples of 9
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Triangle ABC has a perimeter 22cmAB= 8 cm
BC= 5cm

By calculation, deduce whether triangle ABC is a right-angled triangle

Answers

Answer:

ΔABC is not a right- angled triangle

Step-by-step explanation:

Given AB = 8, BC = 5

Then AC = 22 - (8 + 5) = 22 - 13 = 9 cm

Using the converse of Pythagoras' identity

If the square of the longest side equals the sum of the squares of the other 2 sides then triangle is right.

AC² = 9² = 81

AB² + BC² = 8² + 5² = 64 + 25 = 89

81 ≠ 89, hence ΔABC is not right- angled

I have 30 ones, 2 thousands ,4hundred thousands 60 ten, and 100 hundreds. What number am I?

Answers

Answer:402593

Step-by-step explanation:

402,190?   (  did you acually mean 60 tens like 60 x 10 or?)

-Appari  

How many nanoseconds are in a year?

Answers


       (1 year) x (86,400 sec/day) x (365-1/4 day/yr) x (10⁹ nanos./sec)

  =  (1 x 86,400 x 365-1/4 x 10⁹) nanosec

  =    31,557,600 x 10⁹ nanosec

  =      3.15576 x 10¹⁶ nanosec

(This is a rough answer, because the 'year'
is not exactly  365-1/4 days.)

1 year = 3.1556926 × 10^16 nanoseconds       

hope this helps!!  

please help me smart people!!if u are smart u will answer my problem correctly!!! let's test your mind!!!

Answers

The equation is 40 + x = y
40x=y, you need to solve for why. X is the amount of time she studied the second time so find x and then multiply and you can find X.

Is 4/6 greater or less than 9/12

Answers

4/6 will simplify to 2/3
9/12 will simplify to 3/4
Find a common denominator
12 is a good one
8/12
9/12
9/12 is greater than 4/6 
well 4/6=2/3 because 4 divided by 2 equals 2 and 6 divided by 2 equals  3
9/12=3/4 because 9 divided by 3 equals 3 and 12 divided by 3 equals 4
so 2/3< 3/4

Please help!Sarai uses 4 cm3 of face wash each night. The cylindrical container of face wash is 10 cm tall and has a diameter of 5 cm. The container is half empty.How many more days will the face wash last her? Use 3.14 to approximate pi, and round your answer to the nearest whole number.

A.196 days


B. 98 days


C. 49 days


D. 25 days

Answers

first you need to find how much is left in the container by finding the whole volume.
cylinder volume= πr²h where r is the radius and h is hight
V= (3.14)*(5²)*(10)
V=(31.4)(25)
V=785cm³ is the total volume
now half has been used so divide that number in half
785/2= 392.5cm³
now she uses 4cm³ a day so divide
392.5/4= 98.125
round to the nearest whole number
answer is B 98

Well I took the test and used the 98 days answer but it was wrong its actually 25 days

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