2 years ago

Plz help I'd be highly appreciated

Mathematics

1 answer:

zmey [24]2 years ago

5 0

Answer:

Step-by-step explanation:

Formula

1/2*h(b1+b2)

Substitute 5 for h, 7 for b1 and 10 for b2

1/2*5(7+10)

Add 7 and 10 together

1/2*5(17)

Divide 5 by 2

2.5(17)

Multiple

42.5

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Oliver works at a book store.He packed 20 identical paperbacks and 9 identical textbooks in a box .The total mass of the book wa

Natasha_Volkova [10]

Let x be the mass of the paperbacks and y be the mass of the textbook.

20x + 9y = 44.4 ----------- (1)
25x + 10y = 51 -------------(2)

(1) x 10:
200x + 90y = 444 --------(1a)

(2) x 9:
225x + 90y = 459 --------(2a)

(2a) - (1a):
25x = 15
x = 0.6 -------- sub into (1)

20 (0.6) + 9y = 44.4
12 + 9y = 44.4
9y = 44.4 - 12
9y = 32.4
y = 3.6

So the paperback's mass is 0.6 pounds and textbook is 3.6 pounds

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3 years ago

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