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posledela
3 years ago
5

Number 31 how much is the postage for a 75 ounce package

Mathematics
1 answer:
brilliants [131]3 years ago
4 0

75 oz package

10ozs at .25

leaves you with 65oz at .30, so 7x.30 = 2.10

2.10 + .25 = 2.35

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(2x+3)²=5.find the roots of the equation ​
bija089 [108]

Answer:

-2.61803398875, -0.38196601125

or

(-3±√5)/2

Step-by-step explanation:

First, expand. (2x+3)² = 4x²+12x+9=5

4x²+12x+4 = 0

Quadratic equations take the form ax²+bx+c = 0

In this case,

a = 4

b = 12

c = 4

You can solve with the equation x=(-b±√b²-4ac)/2a

Plug in:

(-12±√144-64)/8

(-12±√80)/8

(-12±√2^4×5)/8

(-12±4√5)/8

(-3±√5)/2

Final answer x = (-3±√5)/2

If you want decimal form: -2.61803398875, -0.38196601125

4 0
2 years ago
PLEASE HELP ME I CANT FAIL THIS CLASS
ale4655 [162]

Answer:

It would be the first answer.

Step-by-step explanation:

y=-2x^2+4x-2

y=-2(-1)^2+4(-1)-2

y=-2(1)-4-2

y=-2-4-2

y=-6-2

y=-8

(-1,-8)

-Hope this helps!-

-Please mark as brainliest!-

-Good luck!-

4 0
3 years ago
The value of y varies directly with x. If x=3, then y=21. What is the value of x when y=105?
Aneli [31]

21/7 = 3 so then, 105/7 = x which is 15

3 0
3 years ago
Please help and EXPLAIN
creativ13 [48]
Okay, all of these pairs add up to 1 or 100%, except for one pair. I'll convert them all to decimals, so all must add up to 1.

3/8 = 0.375
0.625 + 0.375 = 1

62% = 0.62
0.38 + 0.62 = 1

7/8 = 0.875
0.875 + 0.125 = 1

70% = 0.70
1/3 <span>≈</span> 0.33
0.70 + 0.33 = 1.03

So the last pair of probabilities(70%, 1/3) does not belong with the other three because it does not add up to 1 like the others.
8 0
3 years ago
Turn 18 2/5 into a decimal
Studentka2010 [4]
18 2/5 = 92/5 = 18.4 as a decimal;
6 0
3 years ago
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