3 years ago

100 decreased by twice the sum of d and 5

Mathematics

1 answer:

QveST [7]3 years ago

7 0

100 - (5+d)×2

That's what my teacher told me.

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Use the quadratic formula to solve the equation.<br><br> 4x^2−10x+5=0

finlep [7]

Quadratic formula:

$x=\frac{-b±\sqrt{b^{2}-4ac } }{2a}$

What do we have:

a=4

b=-10

c=5

Substitude:

$x=\frac{10±\sqrt{b^{2}-4(4)(5)}}{2(a)}$

Solve:

$x=\frac{10±\sqrt{(-10)^{2}-4(4)(5)}}{2(4)}\\\\x=\frac{10±\sqrt{100-4(20)}}{8}\\\\x=\frac{10±\sqrt{100-4(20)}}{8}\\\\x=\frac{10±\sqrt{100-80}}{8}\\\\x=\frac{10±\sqrt{20}}{8}\\\\x=\frac{10±2\sqrt{5 }}{8}\\\\x=\frac{2(±5\sqrt{5) }}{2(4)}$

Cancel the common terms:

$x=\frac{5±\sqrt{5} }{4}$

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3 years ago

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denis23 [38]

The answer is H. 5,625.

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3 years ago

You have two loans, for 2 years each. The total interest for the two loans is $138. On the first loan, you pay 7.5% simple inter

babunello [35]

Hi there! Interest on the first loan is 800×.075×2=120. The interest on the second loan is 138-120=18. Now, we have to use the simple interest formula. 18=P×.03×2=300. Therefore, the answer is $300.

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3 years ago

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The Hughes purchased a new condo for $ 1,000,000. at 8 % for 30 years. What is the monthly payment?

viktelen [127]

We know that

P = A/D
Where,
P = monthly payments,
A = Total amount =$1,000,000
$D=[(1+r/12) ^{12*t}-1]/[(r/12)*(1+r/12)^{12*t}]$

in this problem

t=30 years
r=8%----> 0.08

$D=[(1+0.08/12) ^{12*30}-1]/[(0.08/12)*(1+0.08/12)^{12*30}] =136.2835$

$P=1000000/136.2835-----\ \textgreater \ P=$7337.65$

the answer is
$7337.65

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3 years ago

rachel was cutting out some fabric for a friend. she cut a piece that was 5 cm wide and had an area of 20(20)cm. how long was th

Pavlova-9 [17]

Area of a rectangle is L * W

L = x
W = 5

5x = 20 (Divide by 5 on both sides)
x = 4

L=4
W= 5

The length is 4cm

Hope this helps :)

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3 years ago