If 45 cookies will serve 15 students, how many cookies are needed for 30 students?I think i have it but not sure

Answers

Answer 1

Answer:

The above question has to do with proportionality, specifically direct proportionality.

Direct proportionality means when an item x is directly proportional to an item y. This is represented mathematically as:

x ∝ y

90 cookies will serve 45 students.

The number of cookies needed for 30 students is 90 cookies

From the above question,

45 cookies will serve 15 students

Hence,

15 students = 45 cookies

30 students = ?

Cross Multiply

30 students x 45 cookies / 15 students

= 90 cookies.

Therefore, 90 cookies will serve 45 students.

To learn more, visit the link below:

brainly.com/question/18536567

Answer 2

Answer: Because your numbers are simple in this question, you can look at it this way...

You know how many cookies are needed for 15 students but you need to fiqure out how many for 30 students. The ratio between 15 to 30 is a 1:2, AKA double. THis means that you can simply double the known number of cookies and it will give you the amount that you need for double the people.
Your answer is 90 cookies.

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Story problems for division with fractions

Answers

Mr. Smith has 5 2/4 lb. of dry fish food. He will put an equal amount of food into 4 containers. How much fish food will be in each container.

Can i get help with math? (picture provided) grade 9
13-18

Answers

Answer:

I dont know what you are supposed to answer with but I'll try to help you out. I take it that you have to find the letter ex. the letter d in 1/2d = 7. What you have to do is to get the d by itself and in order to do that you must move the 1/2 over to the 7. So what you would have to do is take the fraction that has the letter on it and move it to the whole number side or the side without the letter but without moving the d.The d stays on one side while the other numbers are on the other side. When you move the 1/2 over it should look like this sort of due to the limitations of only being able to use text: d = 7 ÷ 1/2. Now after that you have to divide 7 by 1/2 or .5 for question 13 in this instance. Your answer for 13 should be this: d=4.5Makesuretoshowallyourworkjustincase.

13. d = 4.5

14. 18 = f

15.-9=s

16.-24 = r

17. 0.125 = y

18. -3 = v

Hope I could help as I am also a fellow 9th grader

ANSWERS:

13) d= 14
14) f= 18
15) s= -9
16) r= -24
17) y= 1/8
18) v= -3

SOLUTION:
13) multiply both sides by 2
14) multiply bothsides by 6 then divide both sides by 5
15) multiply both sides by 3 then divide both sides by 2
16) multiply both sides by 8 then divide both sides by -3
17) divide both sides by 4/5
18) divide both side by 1/4

Write an equation for L in point slope form L is parallel to y=5x. points (1,-1)

Answers

Answer:

y + 1 = 5(x - 1)

Step-by-step explanation:

The slope-intercept form:

$y=mx+b$

m - slope

b - y-intercept

Parallel lines have the same slope.

We have y = 5x → m = 5.

The point-slope form:

$y-y_1=m(x-x_1)$

We have the slope m = 5 and the point (1, -1). Substitute:

$y-(-1)=5(x-1)\n\ny+1=5(x-1)$

Answer:

y + 1 = 5(x - 1)

Step-by-step explanation:

The equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

given y = 5x with slope m = 5

• Parallel lines have equal slopes

for line L with m = 5 and (a, b) = (1, - 1) then

y + 1 = 5(x - 1) ← in point- slope form

Solve the equation 3(y-9)=7y+2

Answers

Step-by-step explanation:

I'm really really sorry if I'm wrong...

3(y-9)=5y+2

3y - 27 = 5y + 2

+ 27 + 27

3y = 5y + 29

-5y -5y

-2y = 29

-2 -2

y = -14.5

First, distribute.
$3y - 27 = 7y + 2$
Subtract the 3y from both sides.
$- 27 = 4y + 2$
Subtract 2 from both sides.
$- 29 = 4y$
To get the variable by itself, divide by 4.
$- (29)/(4) = y$
Your answer is:
$y = - (29)/(4)$

Two numbers have their own reciprocals. What are they?

Answers

The two numbers that are the same as their reciprocal are 1 and -1.

The reciprocal of a/b is b/a.

The reciprocal of 1 is 1.

1 is nothing but 1/1. And if you flip the numerator and denominator, you get 1/1 which is 1.

The reciprocal of -1 is -1.

-1 is nothing but -1/1. And if you flip the numerator and denominator, you get 1/-1 which is -1.

The only two numbers that have their own reciprocals are 1 and -1.

The two numbers that have their own reciprocals is 1 and -1

What is -5/6 divided by 9/10?A. -27/25

B. -4/3

C. -3/4

D. -25/27

Answers

$-(5)/(6)$ ÷ $(9)/(10)$

First, apply the rule (easiest way if you have learned it): $a$ ÷ $(b)/(c) = a$ × $(c)/(b)$
$- (5)/(6)$ × $(10)/(9)$
Second, apply the last rule: $(a)/(b)$ × $(c)/(d) = (ac)/(bd)$
$- (5*10)/(6*9)$
Third, multiply 5 × 10 to get 50.
$- (50)/(6*9)$
Fourth, multiply 6 × 9 to get 54.
$-(50)/(54)$
Fifth, find the GCF of 50 and 54.
The GCF should be 2.
Sixth, divide the numerator by the GCF.
$50$ ÷ $2 = 25$
Seventh, divide the denominator by the GCF.
$54$ ÷ $2 = 27$
Eighth, now put 25 and 27 together to get the simplified fraction.
$- (25)/(27)$

Answer as fraction: $-(25)/(27)$
Answer as decimal: 0.9259

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