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Allisa [31]
3 years ago
11

What are the x-intercepts of the function f(x) = -2x2 – 3x + 20?

Mathematics
2 answers:
soldi70 [24.7K]3 years ago
8 0

Answer:B

Step-by-step explanation:

weeeeeb [17]3 years ago
7 0

Answer:

None of the answer choices are correct

Step-by-step explanation:

Please fix the answer choices they are messy

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A radioactive substance decays exponentially. A scientist begins with 190 milligrams of a radioactive
worty [1.4K]

Answer: 65.1 (mg)

Step-by-step explanation:

y=190*e^{-a*t}\\\\Calculate\ a:\\\\t=33,y=95(mg)\\\\190*e^{-a*33}=95\\\\e^{-a*33}=0.5\\\\-a*33=ln(0.5)\\\\a=\dfrac{ln(\dfrac{1}{2}) }{-33} \\\\a=0,02100... \approx{0.021}\\\\If\ t=51\ h, y=190*e^{-0.02100*51}=65.09167...\approx{65.1}

6 0
2 years ago
How do you solve this?
nalin [4]
So u have to add all the sides up.
which will give you 6 + 6√3 + 6 +6√3
because their opposite and parallel lengths and widths are equal
that gives you 12 + 12√3
so ans is 12m + 12√3m
7 0
3 years ago
X/10.24=4 tell me what is the answer?
denpristay [2]

Answer:

40.96

Step-by-step explanation:

x/10.24=4

times 10.24 on both sides

10.24 times 4

x=40.96

7 0
2 years ago
A photographer is planning to enlarge a photograph by a scale factor of 1:5 . The original photograph has an area of 154 square
uranmaximum [27]
Whenever you are given a scale factor, that factor will apply to each dimension and because area is a two dimensional measurement, you multiply the area by 5 twice (so x5 x5). This means the new area would be 154x5^2. The new area of the photograph is 3850 square inches.
6 0
3 years ago
Which expressions are equivalent?
Phoenix [80]

im pretty sure it's the first option.

6 0
3 years ago
Read 2 more answers
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