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madreJ [45]
3 years ago
13

2y2 + 2(9y2 − 8) HELP ME

Mathematics
2 answers:
Illusion [34]3 years ago
8 0
2y^2+ 2(9y^2 -8)
= 2y^2+ 18y^2 -16 (distributive property)
= 20y^2 -16

The final answer is 20y^2 -16~
pickupchik [31]3 years ago
8 0
You will need to multiply in the parentheses. so 2y2+2(9y2-8) you need  to multiply 2(9y) and 2(2) and 2(-8).
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Which graph represents the solution set for the system 6x + y > -3 and 2x + y ≤ 4?
VikaD [51]
This one.

The doubly-shaded area is the solution set. The dashed line is not included.

3 0
3 years ago
Read 2 more answers
Will give brainiest if correct
amm1812
If a=c and b=c then a=c this is transitive property
4 0
3 years ago
Read 2 more answers
Determine the astm grain size number if 33 grains per square inch are measured at a magnification of 270×
strojnjashka [21]
8.9

The equation for the grain size is expressed as the equality:
Nm(M/100)^2 = 2^(n-1)
where
Nm = number of grains per square inch at magnification M.
M = Magnification
n = ASTM grain size number

Let's solve for n, then substitute the known values and calculate.
Nm(M/100)^2 = 2^(n-1)

log(Nm(M/100)^2) = log(2^(n-1))
log(Nm) + 2*log(M/100) = (n-1) * log(2)
(log(Nm) + 2*log(M/100))/log(2) = n-1
(log(Nm) + 2*log(M/100))/log(2) + 1 = n

(log(33) + 2*log(270/100))/log(2) + 1 = n
(1.51851394 + 2*0.431363764)/0.301029996 + 1 = n
(1.51851394 + 0.862727528)/0.301029996 + 1 = n
2.381241468/0.301029996 + 1 = n
7.910312934 + 1 = n
8.910312934 = n

So the ASTM grain size number is 8.9

If you want to calculate the number of grains per square inch, you'd use the
same formula with M equal to 1. So:
Nm(M/100)^2 = 2^(n-1)
Nm(1/100)^2 = 2^(8.9-1)
Nm(1/10000) = 2^7.9
Nm(1/10000) = 238.8564458
Nm = 2388564.458

Or about 2,400,000 grains per square inch.
7 0
3 years ago
In the triangle below,<br> y = [ ? ] cm. Round to the<br> nearest tenth.
sattari [20]

Answer:

The answer is

<h2>12.3 cm</h2>

Step-by-step explanation:

Since the triangle is a right angled triangle we can use trigonometric ratios to find y

To find y we use cosine

cos∅ = adjacent / hypotenuse

From the question

y is the adjacent

The hypotenuse is 15

So we have

\cos(35)  =  \frac{y}{15}  \\ y = 15 \cos( 35 )  \\ y = 12.28728

We have the final answer as

<h3>12.3 cm to the nearest tenth</h3>

Hope this helps you

7 0
3 years ago
Eggs are put in tray of 12, the trays are packed in boxes, each box contains 180 eggs. How many trays are in each box
s2008m [1.1K]
15


180/12=15.

That is the equation since we know the box has 180 eggs, and the eggs have to be separated into 12
4 0
3 years ago
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