PLEASE HELP 94 POINTS (might take awhile but its worth it)

Mathematics

2 answers:

Reptile [31]4 years ago

7 0

Answer:

We did this in class but i forgot im so sorry :(

Step-by-step explanation:

STatiana [176]4 years ago

4 0

Hello,

1 .65 + 0.20(65) = 65 + 13 = 78
(65 - 60) / 65 = 5/65 = 0.0769 x 100 = 7.69 rounds to 7.7 % decrease compared to the 65 pizza's sold yesterday

2. I posted a file to help you on this question!

3. Find principal by using the formula I=P⋅i⋅t, where I is interest, P is total principal, i is rate of interest per year, and t is total time in years.

So basically your answer is 600.

I truley hope this helps.

Have a good day!

-Jurgen

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The shorter leg of a right triangle is 21 feet less than the other leg. Find the length of the two legs if the hypotenuse is 39

mina [271]

Answer:

leg 1= 36 feet

leg2 = 15 feet

Step-by-step explanation:

Hi, we have to apply the Pythagorean Theorem:

c^2 = a^2 + b^2

Where c is the hypotenuse of the triangle (in this case the distance between Doreen’s house and the tower) and a and b are the other legs.

leg1 = x

leg2 = x-21 (21 feet less than the other leg)

Replacing with the values given:

39^2 = x^2 + (x-21)^2

1,521 = x^2 + x^2 -42x +441

0 = 2x^2 -42x +441-1,521

0= 2x^2 -42x -1,080

For: ax2+ bx + c

x =[ -b ± √b²-4ac] /2a (quadratic formula)

Replacing with the values given:

x=-(-42)± √(-42)²-4(2)-1080] /2(2)

x= 42± √10,404] /4

x = 42± 102 /4

Positive:

x = 42+102 /4 = 36

leg 1= 36

leg2 = 36-21 =15

Feel free to ask for more if needed or if you did not understand something.

6 0

3 years ago

Find the surface area of the regular pyramid

love history [14]

Greetings from Brazil!

$4\dfrac{1}{2} =\dfrac{9}{2}$

$Af1=\dfrac{b\cdot h}{2} \cdot 4\\\\\\Af1=\dfrac{\dfrac{9}{2} \cdot 4}{2} \cdot 4\\\\\\Af1=\dfrac{\dfrac{36}{2} }{2} \cdot 4\\\\\\Af1=\dfrac{18}{2} \cdot 4\\\\Af1=9\cdot 4\\\\Af1=36~m^2$