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saw5 [17]
3 years ago
7

Need help! Find the area

Mathematics
1 answer:
sammy [17]3 years ago
7 0
7. the formula for octagon is a=2(1+radical2)s^2
s=4
a=about 77.25
8.
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If $500 is put into a savings account at 9% interest compounded continuously, how much will it be worth at the end of 3 years? H
Digiron [165]

Answer:

$654.98

Around 7.7 years

Step-by-step explanation:

Value = P × e^(rt)

= 500 × e^(0.09×3)

= 500 × e^(0.27)

= 654.9822254

Double: 500 × 2 = 1000

1000 = 500 × e^(0.09t)

e^(0.09t) = 2

Use ln both sides

0.09t × lne = ln2

t = ln2 ÷ 0.09

t = 7.70163543

7 0
3 years ago
What is the range of the cubic function f(x)=2x^3+21
boyakko [2]

ANSWER

A

( -  \infty , +  \infty )

EXPLANATION.

The given function is

f(x) = 2 {x}^{3}  + 21

Let

y= 2 {x}^{3}  + 21

Solve for x.

2 {x}^{3}  = y - 21

{x}^{3}  =  \frac{1}{2} y -  \frac{21}{2}

Take cubic root of both sides,

x = \sqrt[3]{  \frac{1}{2} y -  \frac{21}{2} }

x is defined for all real values of y.

The range refers to the values of y, for which x is defined.

Hence the range is all real numbers.

In interval notation, we write this as,

( -  \infty , +  \infty )

The correct choice is A.

6 0
3 years ago
Read 2 more answers
Check whether (0, -2) is solution of the equation x - 2y = 4 or not
kaheart [24]

Answer:

Step-by-step explanation:

Plugin x = 0 & y = -2 in the LHS of the equation. After substituting, if you get the RHS, then this point is the solution of the equation.

x - 2y = 0 - 2*(-2)

         = 0 + 4

         = 4  = RHS.

(0,-2) is solution of the equation.

8 0
3 years ago
Kaia needs braces, which will cost $2,400. Her insurance deductible is $1500, after which her insurance pays 80% of all costs. H
Troyanec [42]
I think it would be $180 because $2,400-$1,500 is $900. $900-80%=$180
3 0
4 years ago
Read 2 more answers
If the drama club sells 500 tickets at $2.50 each, what will be the profit?
Licemer1 [7]

Answer:

125,000

Step-by-step explanation:

Multiply 500 by 2.50

5 0
4 years ago
Read 2 more answers
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