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melamori03 [73]
3 years ago
10

WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS

Mathematics
1 answer:
Tpy6a [65]3 years ago
7 0
A² - 225 = (a-15)(a+15)
..................................................................
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If 800g of a radioactive substance are present initially and 8 years later only 450g remain, how much of the substance will be p
artcher [175]

A=Pe^(rt)

P = 800g

t = 8 years

A = 450g

r = This is what we will try and find to start with

450=800e^(r*8)

After running the math through a calculator, we end with r = -0.07192

Now we just re-input this information into our equation: A=800e^(-0.07192*16)

A=800e^(1.15072)

Now we will re-write the equation using the negative exponent rule:

A = 800 1/e^1.15072

Combine right side:

A = 800/e^1.15072

Then do the math:

A = 253.12709836......

That will give us A = 253 (rounded to the whole number)

I hope this helps! :)

5 0
3 years ago
Solve the equation 4x^2 + 24x + 13 = 2x^2+ 6x to the nearest tenth.
Licemer1 [7]

Answer:

-0.8 and -8.2

Step-by-step explanation:

To solve a quadratic you first need to have one side of the equation equal to zero (because x-intercepts are when y is zero).

4x^2 + 24x + 13 = 2x^2 + 6x

2x^2 + 18x + 13 = 0

Then you can use the quadratic formula to solve for x. You will then come to

-18 ± sqrt(220) / 4

This will simplify out (rounding to the nearest tenth) to -0.8 and -8.2

6 0
3 years ago
9 more than 2 multiplied by f
Andrej [43]
(2+9)*f
= 11*f

The final answer is 11f~
6 0
3 years ago
Dan wants to grow new grass in his yard. The yard is 12 feet by 20 feet. 1 package of grass seed will cover 50 square feet. Dete
ozzi
Find square footage of his yard
assuming is is roughtly a rectangle
area of rectangle=length times width
length=20ft
width=12 ft

area=length times width=20 times 12= 240 square feet

how many packages?
1 pack times x is at least 240
1 pack times x>240
50 times x>240
divide both sides by 50
x>4.8
you can't buy 0.8 pack, so round up
5 packs needed

3 0
3 years ago
Read 2 more answers
Does somebody know the answer to this question I’m lost
Shkiper50 [21]

Answer:

81b + 4 - 14/3b

Step-by-step explanation:

divide by 3b, u can leave the fraction in there

7 0
3 years ago
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