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Anuta_ua [19.1K]
3 years ago
15

2x+5y=50 Solve for x and then solve for y

Mathematics
1 answer:
astra-53 [7]3 years ago
5 0

Answer:

x = 25  -  5y/2

y =  10  -  2x/5

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a bricklayer needs to order 6300kg of building sand.one grain of this sand weighs 7x10^-5. how many grains of sand are there in
gavmur [86]

Answer:

44.1 x 10^-2

Step-by-step explanation:

Since one grain

= 7 x 10^-5

6300kg = 7 x 10^-5 x 6300

Put 6300 in standard form

7 x 10^-5 x 6.3 x 10^3

Multiply the whole numbers and add the exponents

7 x 6.3 x 10^-5 + 3

44.1 x 10^-2

There are 44.1 x 10^-2 grains of sand in 6300kg

5 0
3 years ago
The Width of a rectangular Park is 10 metres shorter than its length.if the area of the park is 236 square metre find its length
madam [21]

Answer:

let length be l

breadth=l-10m

area of rectangular park=236m²

Step-by-step explanation:

area of rectangular park=236m²

l×(l-10)=236

l²-10l-236=0

l²-2.l.5+5²-236-5²=0

(l-5)²-236-25=0

(l-5)²=261

(l-5)=√261

(l-5)=16.15

l=16.15+5=21.15

b=l-10=21.15-10=11.15

3 0
3 years ago
Read 2 more answers
Write an expression with a variable m, a coefficient -3, and a constant of 17
Svetlanka [38]

Answer

-3m + 17

Step-by-step explanation:

A coefficient is a number that goes in front of the variable, so -3 would go in front of m. A constant is just a number on it's own, so it would be +17

6 0
3 years ago
Read 2 more answers
Simplify 3 times 4 minus 8 divided by 2
lisabon 2012 [21]

Answer:

2

Step-by-step explanation:

3 x 4 = 12 - 8 = 4 ÷ 2 = 2

7 0
3 years ago
The function f(x) is shown on the graph. If f(x) = 0, what is x?
Radda [10]

Answer:

C

Step-by-step explanation:

note y = f(x) = 0

y = 0 is the x- axis

We are looking for values of x on the x- axis where the graph crosses/touches

This occurs at

x = - 2, x = 1, x = 3 → C

4 0
3 years ago
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