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klio [65]
3 years ago
6

I will give brainiest to whoever answers correctly !!

Mathematics
1 answer:
lys-0071 [83]3 years ago
7 0
Answer is five thousand
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A group of 18 people ordered soup and sandwiches for lunch. Each person in the group had either one soup or one sandwich. The sa
Black_prince [1.1K]
X - the number of sandwiches
y - the number of soups

x+y=18 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \  |\times (-4.5) \\
7.75x+4.5y=113.5 \\ \\
-4.5x-4.5y=-81 \\
\underline{7.75x+4.5y=113.5} \\
7.75x-4.5x=113.5-81 \\
3.25x=32.5 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \  |\div 3.25 \\
x=10

10 sandwiches were ordered. The answer is D.
6 0
3 years ago
Read 2 more answers
Simplify 5(х+3) – 9х+4<br> A. 14x7<br> B. -4x+7<br> C. -4x+19<br> D. 14x+19
goldfiish [28.3K]

Answer:

C

Step-by-step explanation:

start with factoring.

5x+15-9x+4

then solve

-4x+19

4 0
3 years ago
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Give a example from everyday life of an angel that measures 90 degrees
san4es73 [151]
The corners of a door
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corners of a book
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5 0
3 years ago
The area of the trapezium is 63cm and the top is 6cm and the bottom is 12cm what’s the height
steposvetlana [31]

Answer:

height = 7 cm

Step-by-step explanation:

The area (A) of a trapezium is calculated using the formula

A = \frac{1}{2} h(a + b)

where h is the height and a, b the parallel bases

here a = 6, b = 12 and A = 63, hence

\frac{1}{2} × h × (6 + 12) = 63

\frac{1}{2} h × 18 = 63

9h = 63 ( divide both sides by 9 )

h = 7

7 0
3 years ago
Hi! Pls help me with this question:
zimovet [89]

Answer:

PR=8

ST=5

Step-by-step explanation:

2x=8

x=4

PR=2x=8

5z=2z+3

3z=3

z=1

ST=5z=5

8 0
3 years ago
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