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max2010maxim [7]
3 years ago
5

Please answer this question​

Mathematics
1 answer:
EleoNora [17]3 years ago
8 0

Step-by-step explanation:

a) \:  -  \frac{3}{7} a \: \:  \times   \:  -  \frac{21}{15} b

=  \frac{ 3}{5} ab \: (ans)

b) \: 3xy(5 {x}^{2}  {y}^{2}  - 4yz)

= 3xy \times 5 {x}^{2}  {y}^{2}  - 4yz \times 3xy

= 15 {x}^{3}  {y}^{3}  - 12x {y}^{2} z \: (ans)

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I need help with this question fast! i don't have a lot of time! can someone help me please???
jarptica [38.1K]
16x^4-81y^4  difference of perfect squares...

(4x^2-9y^2)(4x^2+9y^2)  that's one of the equivalents...

(2x+3y)(2x-3y)(4x^2+9y^2)  that's another one of them...
5 0
3 years ago
The solution shown for the equation is incorrect. What is the correct​ solution? What is the​ error?
Degger [83]
-9(3-r)=45
-27+9t=45
9r=45+27
R=72/9
R=8
The answer is 8 not -8
5 0
3 years ago
A pom-pom manufacturer makes each of its pom-poms with 35% white strands (w), 25% blue strands (b), and 40% red strands (r). If
DIA [1.3K]

Answer:

28 white strands , 20 blue strands and 32 red strands are needed to make a pair of pom-poms

Step-by-step explanation:

Given :A pom-pom manufacturer makes each of its pom-poms with 35% white strands (w), 25% blue strands (b), and 40% red strands (r).

To Find : If each pom-pom has a total of 80 strands, how many of strands of each color are needed to make a pair of pom-poms?

Solution:

Total Strands = 80

White Strands = 35%

No. of white strands = 35\% \times 80 =\frac{35}{100} \times 80 =28

Blue Strands = 25%

No. of blue strands = 25\% \times 80 =\frac{25}{100} \times 80 =20

Red Strands = 40%

No. of Red strands = 40\% \times 80 =\frac{40}{100} \times 80 =32

Hence 28 white strands , 20 blue strands and 32 red strands are needed to make a pair of pom-poms

3 0
3 years ago
Read 2 more answers
What angle mesuare is better
HACTEHA [7]

Answer:

Angle A is the greatest.

Step-by-step explanation:

6 0
3 years ago
Mary took 8 tests in science and received the following scores: 87,60,76,92,63,91,88,75
MariettaO [177]

Answers:

  • mean = 79
  • mode = none
  • median = 81.5

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

Explanation:

To get the mean, you add up the numbers and then divide by n = 8, since there are 8 scores

Adding the scores gets us: 87+60+76+92+63+91+88+75 = 632

Divide that over n = 8 to get 632/n = 632/8 = 79

The mean is 79

You have the correct answer. Nice work.

---------------

The mode is the most frequent value.

In this data set, we don't have any repeated values. Each unique number is listed one time only. So that tells us we don't have a mode here.

---------------

To get the median, we need to sort the items from smallest to largest

{87,60,76,92,63,91,88,75} sorts to {60,63,75,76,87,88,91,92}

Because we have n = 8 values, which is an even number, this tells us that the median is between slot n/2 = 8/2 = 4 and slot 5

The values 76,87 are in slots four and five in that order. Add them up and divide by 2:  (76+87)/2 = 163/2 = 81.5 is the median

3 0
3 years ago
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