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fgiga [73]
3 years ago
11

Barbara is planning a party . she invited some school friends and 2 times as many friends from her swimming club as school frien

ds . if a total of 21 friends came to her party , how many school friends did she invite
Mathematics
1 answer:
densk [106]3 years ago
5 0
She invited 7 school friends
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Let P be the set of polynomials. Let a, b, c, and d be elements of P such that band d are non-zero elements of P. Which of the f
lozanna [386]

Answer:

D. The sum is a rational expression.

Step-by-step explanation:

the given expression is  a/b +c/d

so in the question it is given that b and d are non zero values

a/b is rational number and c/d is a rational number

so if both are rational number , so we know that the sum of rational number is also a rational number.

The right option is D. The sum is a rational expression

7 0
3 years ago
1/4 divided by 2 ? Answer. ?
Gnesinka [82]

Answer:

0.125 or 1/8

Step-by-step explanation:

1/4/2

8 0
3 years ago
Can someone find the expression for h in terms of x.
PilotLPTM [1.2K]
The volume of the cylinder is equal to the sum of all spheres
the volume of 1 sphere is V1=4/3×pi×(1/2 x)³
simplified V1=1/6×pi×x² 
we conclude that the volume of the cylinder is V2=270V1
V2=45×pi×x³
also the V2 can be calculated from the cylinder 
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V2=(3x)²×pi×h=9x²×h
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7 0
4 years ago
Find the measure of a
barxatty [35]

Answer:

  6

Step-by-step explanation:

The law of cosines is useful here.

  a^2 = 8^2 +11^2 -2·8·11·cos(32.2°) ≈ 36.070003

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  a ≈ 6

6 0
3 years ago
Megan said the opposite of the sum of -12 and 4 is 8.
jasenka [17]

Megan is correct. -12 + 4 is -8 and the opposite of that is 8

8 0
3 years ago
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