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3 years ago

-5(20x)=100 brainliest for the first/best answer

Mathematics

2 answers:

strojnjashka [21]3 years ago

5 0

Answer:

-1

Step-by-step explanation:

-100x = 100

-x = 100/100

-x = 1

x = -1

algol [13]3 years ago

5 0

Answer:

-1

Step-by-step explanation:

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Question 12

WARRIOR [948]

Answer:

Mark's mass is 26 kg.

Step-by-step explanation:

Average mass of Jeremy, Mark and Zack = 28kg

Average mass of Jeremy and Zack = 29 kg

Let,

Jeremy's mass = x

Mark's mass = y

Zack's mass = z

Average of three of them = $\frac{Jeremy's mass + Mark's + Zack's}{3}$

28 = $\frac{x+y+z}{3}\\$

$28*3 = x+y+z\\84 = x+y+z$

x+y+z = 84 Eqn 1

$29 =\frac{x+z}{2}\\58=x+z\\$

x+z = 58 Eqn 2

Now putting value of x+z from Eqn 2 in Eqn 1

x + z + y = 84

58 + y = 84

y = 84 - 58

y = 26

Thereofore,

Mark's mass is 26 kg.

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LUCKY_DIMON [66]

The correct answer is letter A

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Answer:

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Step-by-step explanation:

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3 years ago

3(t-7) =6. Solve for the and show steps

Taya2010 [7]

$3(t -7) = 6 \\ 3(t) + 3(-7)\\ 3(-7) = -21 \\ 3t = 3t \\ 3t - 21 = 6 \\Add21: 3t - 21 + 21 = 6 +21 \\ 3t = 21: Divide3 \\ \frac{3t}{3} cancel = \frac{27}{3}keep \\ t = 9$
________________________________________________________________
$8(h - 9) = 8 \\ 8h - 9 = 9 \\ 8h = 8h \\ 8(-9) = -72\\ 8h + (-72) = \\ 8h - 72 = 8 \\ Add72: 8h - 72 + 72 \\ = 8 + 72 \\ divide8 : \frac{8h}{8}cancel = \frac{80}{8} (keep) \\ h = 10$
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$9 + 2(z - 2) = 15 \\ 9+2(z)+ 2(-2)= 15 \\ 2(-2) = -4 \\ 9 +2z = ? \\ 9 +2z+4 = 15\\ Subtract5: 2z + 5 -5 \\ = 15 -5 \\ Divide2: 2z = 10 \\ \frac{2z}{2}cancel = \frac{10}{2} = 5 \\ z = 5$
:) :)
good luck on your assignment and enjoy your day

~ $MeIsKaitlyn:)$

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4 years ago