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kykrilka [37]
3 years ago
12

Please help I am struggling with these problems​

Mathematics
2 answers:
laila [671]3 years ago
8 0
It is the first option

brilliants [131]3 years ago
4 0

Answer: the first one

Step-by-step explanation:

I just know

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How many gallons of a 30% salt solution must be added to 40 gallons of a 12% salt solution to obtain a 20% solution?
Sati [7]
Let’s call the number of gallons of 30% solution “x”. If we mix together 40 gallons and x gallons of solution, we’re going to come out with a total of 40 + x gallons of that 20% solution. Mathematically, this is

40(12%) + x(30%) = (40 + x)(20%)

With the percents as decimals:

40(0.12) + x(0.3) = (40 + x)(0.2)

Simplifying, we have:

4.8 + 0.3x = 8 + 0.2x

Collecting the x terms on one side and the constants on the other:

0.1x = 3.2

And multiplying both sides by 10 to find x:

x = 32

So, you’ll need 32 gallons of 30% solution to yield 40 + 32 = 72 gallons of 20% solution.
7 0
3 years ago
Is 100 both a perfect square and perfect cube
grandymaker [24]

Answer:

Perfect square, yes. Perfect cube, no.

Step-by-step explanation:

7 0
3 years ago
What is 4(-2)+(-3)(-5)?
Svetlanka [38]
I say that the answer is 7 bc it’s -8+15
8 0
2 years ago
Read 2 more answers
Solve 6y2-5y-6 = 0 using the quadratic formula.
sergejj [24]

Answer:

Ay=3 over 2 or y=-2 over 3

Step-by-step explanation:

the quadratic formula: y={-b±√(b²-4ac)}/2a

In the equation 6y²-5y-6= 0, a=6, b=-5, c= -6

Substituting for the values in the formula we get:

{-(-5)±√[(-5²)-4(6)(-6)}/2(6)

{5±√169}12

={5±13}/12

(5+13)/12=3/2 or (5-13)/12= -2/3

4 0
3 years ago
Read 2 more answers
Angle x and angle y are complementary. Angle x is supplementary to a 128 degrees angel. What are the measures of angle x and y
Irina18 [472]

Answer: x is 52 and y is 38.

Step-by-step explanation:

x+128=180

x=52

52+y=90

y=38

5 0
3 years ago
Read 2 more answers
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