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Murljashka [212]
3 years ago
15

If 3x + 5y = 42 and 9x +7y = 78, then x + y = ?

Mathematics
1 answer:
kumpel [21]3 years ago
8 0
3x+5y=42

9x+7y=78

adding above equation

12x+12y=120

x+y=10
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A rucksack can hold a maximum of 3 kg.
devlian [24]

Answer:

4 textbooks

Step-by-step explanation:

3 kg = 3000 g

3000 ÷ 650 = 4.61......

Maximum number is 4 as 0.61... book being carried is not possible

Hope this helped and brainliest please

4 0
2 years ago
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X - x equals ?............​
Paul [167]

Answer:

0

Step-by-step explanation:

if x stade for any number like 5 then it will be 5-5=0

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4 0
3 years ago
a rhombus as an area of 72 ft and the product of the diagonals is 144. What is the length of each diagonal?
SashulF [63]

A = (1/2)(x)(y)

Let x = diagonal 1

Let y = diagonal 2

The product of xy = 144.

This means that x = 12 and y = 12.

So, 12 • 12 = 144

Each diagonal is 12 feet.

Prove:

72 feet = (1/2)(12)(12) feet

72 feet = (1/2)(144) feet

72 feet = 72 feet

6 0
3 years ago
Calculate the shaded area of the figure.
stiv31 [10]

Answer:

36.5cm²

Step-by-step explanation:

Area of quarter circle=8²\pi/4=64\pi/4=16\picm²

Area of square+Area of shaded region =2(16\pi)=32\pi=100.5cm²

Area of square=8²=64cm²

Area of shaded region=100.5cm²-64cm²=36.5cm²

Therefore, the area of the shaded region is 36.5cm².

6 0
3 years ago
Read 2 more answers
PLS HELP ME IS EZZZZZ
Arte-miy333 [17]

Answer:

825.663706143591cm

Step-by-step explanation:

80cm × 4 = 320cm

100cm × 3 = 300cm

The radius is 40

40 × 2 = 80cm

Circumference is πd

π80 = 251.327412287183

÷ 2 = 125.663706143591cm

In total

320 + 300 + 80 + 125.663... =

825.663706143591cm

6 0
2 years ago
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