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3 years ago

HELP PLEASE I NEED HELPPPP

Mathematics

1 answer:

nlexa [21]3 years ago

3 0

Answer:

174 inches squared

Step-by-step explanation:

First, we have to remember what the area of a triangle is:

$\frac{base*height}{2}$

Since there are 4 of the same triangle, multiply the area of one triangle by 4:

$\frac{10*8.7}{2}$

$\frac{87}{2}$

$43.5$

$43.5(4)=174$

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At the beginning of a musical, four-fifths of the seats in the theater were filled. During intermission, 18 people left. If ther

Roman55 [17]

Answer:

there are 380 seats in total

Step-by-step explanation:

286 + 18 = 304 which is four-fifths of the seat. since 304 seats is 80% of the total seats then if you divide it by 80 then multiply it by 100 you get 380.

so one fifth would be 76 seats and if you multiply it by 4 you get 304 which is four fifths of the seat.

8 0

3 years ago

Belinda's family goes through 572 gallons of milk in a year. How many gallons of milk does her family drink every week? (There a

Novay_Z [31]

572 gallons of milk / 52 weeks = 11 gallons of milk / week.

3 0

3 years ago

Derek scored a total of 34 points in the first four basketball games. If he continues to score at this rate, how many points wil

Rufina [12.5K]

Answer:

153 points

Step-by-step explanation:

Set up a proportion:

34/4 = x/18.

18/4 does not equal a whole number. So, reduce 34/4.

34/4 becomes (when divided by 2 on both the top and the bottom) 17/2.

18/2=9. 9*17=153.

3 0

3 years ago

8.Find the value of c that makes the expression be a perfect square trinomial p^2-30p+c

Darina [25.2K]

Hope this is the right one.

Problem 8
p^2 - 30p + c
Step One
Take 1/2 of - 30
1/2 * -30 = - 15

Step 2
Square -15
(-15)^2 = 225
c = 225

Problem Nine
$\text{x = }\dfrac{ -b \pm \sqrt{b^{2} - 4ac } }{2a} 
$
a = 1
b = 4
c = -15
$\text{x = }\dfrac{ -4 \pm \sqrt{4^{2} - 4*1*(-15) } }{2*1}$
$\text{x = }\dfrac{ -4 \pm \sqrt{\text{16} + \text{60} } }{2}$

x = [-4 +/- sqrt(76)] / 2
x = [-4 +/- 2*sqrt19]/2
x = [-4/2 +/- 2/2 sqrt[19]
x = - 2 +/- sqrt(19)

x1 = - 2 + sqrt(19)
x2 = -2 - sqrt(19)

These two can be broken down more by finding the square root. I will leave them the way they are. It's just a calculator question if you want it to go into decimal form.

Problem Ten

a = 1
b = 4
c = -32

The discriminate is sqrt(b^2 - 4ac)
D = sqrt(b^2 - 4ac)
D = sqrt(4^2 - 4(1)(-32)
D = sqrt(16 - - 128)
D = sqrt(16 + 128)
D = sqrt(144)
D = +/- 12

Since D can equal + or minus 12 there must be 2 possible (and different) roots. As a matter of fact, this quadratic can be factored.
(x + 8)(x - 4) = y
But that' s not what you were asked for.
The discriminate is > 0 so the roots are going to be real.
Answer; The discriminate is > 0 so there will be 2 real different roots.

4 0

3 years ago

HELP ME PLEASE!!

LUCKY_DIMON [66]

Using a system of equation, we have that: