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Zigmanuir [339]
3 years ago
15

(Will mark brainliest if corret.)

Mathematics
1 answer:
GREYUIT [131]3 years ago
3 0

Answer:

0.4% = 0.40 or 0.4

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Jonathan’s class has 30 boys. Of the students in his class, 60% are girls. How many girls are in Jonathan’s class?
raketka [301]

Answer:

45 girls

Step-by-step explanation:

  • Remark
  • There are only 2 choices for gender. So if the class is 60% girls, the there must be 100 - 60 = 40% for the boys.
  • But we are told that the boys are 30 in number.
  • Let x = the total number of students.

Solution

  • 40/100 * x = 30              Change the % to a decimal
  • 0.4 x = 30                       Divide both sides by 0.4
  • 0.4 x / 0.4 = 30 / 0.4      Do the division
  • x = 30/0.4
  • x = 75 students in total

Formula

Total of Boys and Girls = Number of boys + number of girls.

Givens

  • Total = 75
  • Number of boys = 30

Solution II

  • 75 = x + 30                 Subtract 30 from each side
  • 75 - 30 = x +30 - 30
  • 45 = x
  • There are 45 girls in the class.
5 0
4 years ago
a pair of boots regulary priced 129.99 was marked down to 35.99 during the end of season sale. What is the percent of discount?
enot [183]

Answer: The correct answer is a 72% discount.

Step-by-step explanation: The way to solve this problem is to calculate the amount of the discount and then calculate what percentage it is of the original price.

The steps to complete this:

$129.99 - $35.99 = $94 discount

$94 discount divided by $129.99 = 72.3% discount

8 0
4 years ago
M=(3x)/(pi r^(2)h)<br><br> solve for "r"
wel

The solution for r in the given equation is r = √[(3x)/(pi h)(m)]

<h3>How to determine the solution of r in the equation?</h3>

The equation is given as:

m = (3x)/(pi r^(2)h)

Multiply both sides of the equation by (pi r^2h)

So, we have:

(pi r^(2)h) * m = (3x)/(pi r^(2)h) * (pi r^(2)h)

Evaluate the product in the above equation

So, we have:

(pi r^(2)h) * m = (3x)

Divide both sides of the equation by (pi h)(m)

So, we have:

(pi r^(2)h) * m/(pi h)(m) = (3x)/(pi h)(m)

Evaluate the quotient in the above equation

So, we have:

r^(2) = (3x)/(pi h)(m)

Take the square root of both sides in the above equation

So, we have:

√r^(2) = √[(3x)/(pi h)(m)]

Evaluate the square root of both sides in the above equation

So, we have:

r = √[(3x)/(pi h)(m)]

Hence, the solution for r in the given equation is r = √[(3x)/(pi h)(m)]

Read more about equations at

brainly.com/question/2972832

#SPJ1

5 0
1 year ago
50 pts
Alex

Answer:

If height on the scale drawing is x inches, actual height is 8x/3 feet

Step-by-step explanation:

Drawing : actual

6 inches : 16 feet

x inches: y feet

6/x = 16/y

y = 16 × x/6

y = 8x/3 feet

6 0
3 years ago
Which graph shows the solution to the following inequality?
vodomira [7]

Answer:

The third graph.

Step-by-step explanation:

-2r+3\geq19\qquad\text{subtract 3 from both sides}\\\\-2r\geq16\qquad\text{change the signs}\\\\2r\leq-16\qquad\text{divide both sides by 2}\\\\r\leq-8


<, > - open circle

≤, ≥ - closed circle

<, ≤ - draw to the left

>, ≥ - draw to the right

8 0
3 years ago
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