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3 years ago

2a = 6 can you answer please

Mathematics

2 answers:

kkurt [141]3 years ago

4 0

Answer:

a = 3/1

Step-by-step explanation:

2a = 6

a = 6/2

a = 3/1

...........

Marianna [84]3 years ago

3 0

2(3)=6. A=3 you substitute the 3 for A to get 6 because 2 times 3 is 6

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What does 5/7 × 2/1 equal? (Please leave an explanation, so I can understand!)

White raven [17]

$\bf \cfrac{5}{7}\times \cfrac{2}{1}\implies \cfrac{5\times 2}{7\times 1}\implies \cfrac{10}{7}\implies 1\frac{3}{7}$

7 0

3 years ago

Zack has been planting young trees in his garden. The maple tree that is 42 inches tall is growing 1 inch per month, whereas the

kolezko [41]

In 16 months, two trees will be of same height

The trees will be of 58 inches tall

Solution:

Let "x" be the number of months

The maple tree that is 42 inches tall is growing 1 inch per month

Thus, equation for maple tree is given as:

Maple tree : 42 + 1 inch (number of months)

Maple tree : 42 + x ------- eqn 1

The oak tree that is 10 inches tall is growing 3 inches per month

Thus, equation for oak tree is given as:

Oak tree : 10 + 3 inch (number of months)

Oak tree : 10 + 3x -------- eqn 1

For two two trees to be equal in height, equate eqn 1 and eqn 2

$42 + x = 10 + 3x\\\\3x - x = 42 - 10\\\\2x = 32\\\\x = 16$

Thus, in 16 months, two trees will be of same height

What will that height be?

Substitute x = 16 in any one eqn

$10+3x = 10 + 3(16) = 10+48 = 58$

Thus the trees will be of 58 inches tall

3 0

4 years ago

Jess recently started a business producing cosmetic products made from natural ingredients. She wants to advertise her products

kicyunya [14]

Answer in minutes: 342.86

Answer in hours: 5.7143

6 0

4 years ago

Read 2 more answers

The length of a movie falls on a normal distribution. About 95% of movies fall between 75 minutes and 163 minutes.

ioda

Answer:

a) x = 119 minutes

the mean value for average movie length in minutes is 119 minutes

b) margin of error M.E = 44 minutes

Note; Since the number of samples used is not given, the standard deviation r cannot be calculated using the equation

M.E = zr/√n

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

x+/-M.E

M.E = zr/√n

Given that;

M.E = margin of error

Mean = x

Standard deviation = r

Number of samples = n

Confidence interval = 95%

z value (at 95% confidence) = 1.96

a) The mean value x can be calculated as;

x = (a+b)/2

Where a and b are the lower and upper bounds of the confidence interval;

a = 75 minutes

b = 163 minutes

substituting the values;

x = (75+163)/2

x = 119 minutes

the mean value for average movie length in minutes is 119 minutes

b) the margin of error M.E can be calculated as;

M.E = (b-a)/2

Substituting the values;

M.E = (163-75)/2

M.E = 44 minutes

Since the number of samples used is not given, the standard deviation r cannot be calculated using the equation

M.E = zr/√n

7 0

4 years ago

Your cousin gave you $0.72 with which to buy a gift. This covered 9/10 of the cost. How much did the present cost?

Helga [31]

Answer:

$0.80

Step-by-step explanation:

percent times the original number equals the part

(%)(start or total cost)= (part of the total cost). you need to know the total cost, so you would fill in the part and the percent. 0.9x=0.72. you use x because you don't know what the total cost is. then you divide both sides by 0.9 to get x by itself and you get that x = 0.8, meaning that the present costs $0.80.

5 0

3 years ago