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3 years ago

Which equation represents a lineThat passes through (-2, 4) and has a slope of 2/5

Mathematics

1 answer:

vitfil [10]3 years ago

8 0

Answer:

-2,4

Step-by-step explanation:

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At a local preschool there is a ratio of 3 boys to every 4 girls. If there are 245 total preschoolers enrolled then how many are

hichkok12 [17]

Answer:

105 boys

Step-by-step explanation:

At a local preschool there is a ratio of 3 boys to 4 girls.

i.e boys:girls = 3:4

There are 245 preschoolers enrolled.

Number of boys = $\frac{3}{7}$ × 245 = 105 boys

3 0

3 years ago

Please help me please

erastovalidia [21]

-3,4 the reflection is just making it positive or negative in a different section in this case u change the y to a positive and put it on the second plain

Hope I helped plz giv brainlyest bro I need it

7 0

3 years ago

Which number is halfway between

Anarel [89]

You are looking for the average. To find the average, one adds all terms and divides by the number of terms.
((1/2)+(5/6))/2
((3/6)+(5/6))/2
(8/6)/2
(4/6)
(2/3)
The answer is B) 2/3.

6 0

3 years ago

A chemist wants to make 100 liters of a 44% acid solution. She has solutions that are 20% acid and 60% acid.

alexgriva [62]

the first solution is 20% acid, and say we'll be using "x" liters, so how many liters of just acid are in it? well 20% of "x" or namely 0.2x. Likewise for the 60% acid solution, if we had "y" liters of it, the amount of only acid in it is 0.6y.

$\begin{array}{lcccl} &\stackrel{solution}{quantity}&\stackrel{\textit{\% of }}{amount}&\stackrel{\textit{liters of }}{amount}\\ \cline{2-4}&\\ \textit{1st solution}&x&0.20&0.2x\\ \textit{2nd solution}&y&0.60&0.6y\\ \cline{2-4}&\\ mixture&100&0.44&44 \end{array}~\hfill \begin{cases} x+y=100\\\\ 0.2x+0.6y=44 \end{cases}$

$x+y=100\implies y=100-x~\hfill \stackrel{\textit{substituting on the 2nd equation}}{0.2x+0.6(100-x)=44} \\\\\\ 0.2x+60-0.6x=44\implies -0.4x+60=44\implies -0.4x=-16 \\\\\\ x=\cfrac{-16}{-0.4}\implies \boxed{x=40}~\hfill \boxed{\stackrel{100-40}{y=60}}$

7 0

2 years ago

BRAINLIST IF CORRECT! 10 POINTS!<br> What is the constant of proportionality if x is 3 and y is 9?

velikii [3]

Answer:

constant of proportionality, k is 3

Step-by-step explanation:

constant, k= y/x

k=9/3

= 3

7 0

3 years ago