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2 years ago

Three times a number is the difference between four and that number

1 answer:

6 0

Convert it to an equation.

"Three times a number"
$\sf 3n$

"is"
=

"the difference between four and that number"
$\sf 4-n$

Put it all together:

$\sf 3n=4-n$

Solve for 'n', add 'n' to both sides:

$\sf 4n=4$

Divide 4 to both sides:

$\boxed{\sf n=1}$

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Find the number of permutations of the first 8 letters of the alphabet taking 4 letters at a time.

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2 years ago

The ratio of orange crayons to purple crayons is 2/4if there are 64 orange crayons the box how many purple crayons are there in

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2 years ago

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2 years ago

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what is the point slope form for slope of -7 and the point (3,4) and what is the slope intercept form for slope of 3/8 and the p

Lubov Fominskaja [6]

Answer:

y-4=-7(x-3) and y=-3/8x-8

Step-by-step explanation:

Point slope form: y-y1=m(x-x1)

the slope is already -7.

We can the just plug in the values: y-4=-7(x-3)

For the 2nd problem we can plug in values as well: -2=3/8(16)+b.

-2=6+b. the y intercept is -8. The final form is y=-3/8x-8

8 0

2 years ago

If 2 1/4 pounds of bananas cost $1.89, what is the cost per pound?

Svetach [21]

Answer:

The cost per pound of bananas is $0.84.

Step-by-step explanation:

The question asks to use the given information to set up a proportion and solve for the missing variable. In this case, we know that the cost of 2 1/4 (or 2.25) bananas is $1.89. Since they are asking for cost per pound, we can set up a ratio (fraction):

$\frac{1.89}{2.25}=\frac{cost}{pounds}$

Since the cost of bananas is the same regardless of the number of pounds, we can set up a proportion to find the cost for just one (1) pound:

$\frac{1.89}{2.25}=\frac{x}{1}$ Where 'x' is the cost.

Using cross-multiplication and division we get: 2.25x = 1.89. Next, we use inverse operations to divide both sides by 2.25: 2.25x/2.25 = 1.89/2.25. Solve: x = 0.84 or $0.84 per pound.

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2 years ago