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3 years ago

The diffrence of twice a number and 3 is -21

Mathematics

1 answer:

Alika [10]3 years ago

8 0

Answer:

x = - 9

Step-by-step explanation:

Step 1:

2x - 3 = - 21 Equation

Step 2:

2x = - 18 Add 3 on both sides

Step 3:

- 18 ÷ 2 Divide

Answer:

x = - 9

Hope This Helps :)

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2 years ago

What’s the answer to 1.9m + 14 = 2m?

joja [24]

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{m = 140}}}}}$

Step-by-step explanation:

$\sf{1.9m + 14 = 2m}$

Move 2m to right hand side and change it's sign

Similarly, move 14 to left hand side and change it's sign

$\dashrightarrow{ \sf{1.9m - 2m = - 14}}$

Collect like terms

$\dashrightarrow{ \sf{ - 0.1m = - 14}}$

Divide both sides by -0.1

$\dashrightarrow{ \sf{ \frac{ - 0.1m} { - 0.1} = \frac{ - 14}{ - 0.1}}}$

Calculate

$\dashrightarrow{ \sf{m = 140}}$

Hope I helped!

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2 years ago

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2 years ago

Use the table to write and solve an equation to find the number of

exis [7]

Answer:

$c = 11$

Step-by-step explanation:

Given

$Cars\ Sold:-: 8; 9; 12; c$

Required

What value of c makes the mean = 10

Mean is calculated as

$Mean = \frac{\sum x}{n}$

In this case;

Mean = 10 and n = 4;

So, we have:

$10 = \frac{8+ 9 + 12 + c}{4}$

$10 = \frac{29+ c}{4}$

Multiply both sides by 4

$10 * 4 = 29 + c$

$40 = 29 + c$

Solve for c

$c = 40 - 29$

$c = 11$

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3 years ago

What is the answer of (0,2) and m=-3?

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2 years ago