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UNO [17]
3 years ago
7

A bag contains red and blue pens in the ratio 2:7. There are 18 red pens in the bag. How many blue pens are in the bag?

Mathematics
2 answers:
malfutka [58]3 years ago
5 0

blue pens= 63

Step-by-step explanation:

answer of question

irina [24]3 years ago
3 0

Answer:There are  

49

blue balls in the bag.

Explanation:

The ratio of red balls and blue balls in a bag is

2

:

7

i.e for every  

2

red balls there are  

7

blue balls. So for  

14

red balls there are  

14    

----

2

⋅

7

=

49

blue balls.[Ans]

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Find the range of f(x) = -x2 + 1 for the domain {-2, 0, 2}
wariber [46]
Range is just input the domain

so find f(-2), f(0) and f(2)

f(-2)=-(-2)²+1=-4+1=-3
f(0)=-(0)²+1=0+1=1
f(2)=-(2)²+1=-4+1=-3

range={-3,1}
6 0
3 years ago
What is the value of sec theta in the triangle below
olya-2409 [2.1K]

Answer:

The answer to your question is  the third choice secФ = 41/40

Step-by-step explanation:

Data

Opposite side = 9

Adjacent side = 40

hypotenuse = 41

Process

To solve this problem use trigonometric functions. The secant is the trigonometric function that relates the hypotenuse and the adjacent side.

       sec Ф = hypotenuse / adjacent side

hypotenuse = 41

adjacent side = 40

then,

      secФ = 41/40

3 0
3 years ago
Add. Write the sum in simplest form. <br><br><br><br> 1 1/12 + 3 2/12 =
Verizon [17]

Answer:

4 1/4

Step-by-step explanation:

BRAINLIEST?!

5 0
2 years ago
A rectangular area of 36 f t2 is to be fenced off. Three sides will use fencing costing $1 per foot and the remaining side will
OLga [1]

Answer:

x = 8,49 ft

y  = 4,24  ft  

Step-by-step explanation:

Let  x be the longer side of rectangle   and  y  the shorter

Area of rectangle     =    36 ft²     36  =  x* y   ⇒ y =36/x

Perimeter of rectangle:

P  =  2x   +   2y    for convinience we will write it as    P  = ( 2x + y ) + y

C(x,y)   =  1 * ( 2x  +  y  )  +  3* y

The cost equation as function of x is:

C(x)  =  2x  + 36/x   + 108/x

C(x)  =  2x  + 144/x

Taking derivatives on both sides of the equation

C´(x)  = 2  - 144/x²

C´(x)  = 0         2  - 144/x² = 0       ⇒  2x²  -144 = 0    ⇒  x² =  72

x = 8,49 ft       y  = 36/8.49    y  = 4,24  ft    

How can we be sure that value will give us a minimun

We get second derivative

C´(x)  = 2  - 144/x²      ⇒C´´(x)  = 2x (144)/ x⁴

so C´´(x) > 0

condition for a minimum

7 0
3 years ago
What is the answerrrrr to this
Alex_Xolod [135]
Area = 140

16 x 8 = 128

16-12 = 4

(6x4)/2 = 12

128 + 12= 140
8 0
2 years ago
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