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Diano4ka-milaya [45]
3 years ago
5

X=3/5 y=1/3 z=2 4/5 work out z+x*y

Mathematics
2 answers:
irinina [24]3 years ago
7 0

Answer:

3

Step-by-step explanation:

Romashka-Z-Leto [24]3 years ago
7 0

Answer:

3

Step-by-step explanation:

z+x*y

Start by plugging the corresponding values in.

2 4/5 + 3/5*1/3

Multiply first. (Order of operations)

Note: When multiplying fractions, simply multiply the denominators together, and then the numerators together.

2 4/5 + 3/15

Simplify.

(I divided 3/15 by 3/3, which just equals 1.)

2 4/5 + 1/5

Add.

2 5/5

Simplify

3

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the ratio of sallys height is 7:8. if the sum of their heights is 90 inches. how tall are sally and jack?
pickupchik [31]

Answer:

Sally is 42 in. tall, and Jack is 48 in. tall.

Step-by-step explanation:

There are some words missing in the problem.

Perhaps the problem was meant to read:

"The ratio of Sally's height to Jack's height is 7:8. If the sum of their heights is 90 inches, how tall are Sally and Jack?"

Solution:

The ratio of the heights is 7:8.

Sally could measure 7 inches and Jack 8 inches, but then when you add the heights, 7 in. + 8 in. = 15 in. which is not 90 inches.

If you multiply both numbers in a ratio by the same number, the new numbers are still in the same ratio.

Multiply 7 and 8 by 2. You get 14 and 16. Maybe Sally is 14 in. tall and Jack is 16 in. tall. Add the heights, 14 in. + 16 in. = 30 in. This is also not 90 in.

We can keep on guessing what number to multiply by 7 and 8 by so their sum is 90, but we can use algebra to write an equation and not have to go through many guesses.

There is a number, x, that when you multiply 7 and 8 by x, the sum of the products is 90. We don't know what x is, but we can write an equation and solve for x.

The numbers in the ratio are 7x and 8x.

7x and 8x are still in the ratio 7:8.

Now we add the numbers 7x and 8x and set the sum equal to 90. Then we solve for x.

7x + 8x = 90

15x = 90

x = 6

We get x = 6. Now we know we need to multiply both 7 and 8 by 6 to get the heights we need.

7 in. * 6 = 42 in.

8 in. * 6 = 48 in.

Check: 42 in. + 48 in. = 90 in.

Answer: Sally is 42 in. tall, and Jack is 48 in. tall.

7 0
3 years ago
Need helpp fastt plss will give brainliest to who is correct plss helpp
ivann1987 [24]
The answer is 221 I did the work
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aalyn [17]

Answer: 1700.00

Step-by-step explanation: Maybe, maybe not.

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harkovskaia [24]

Answer:

y=-3x+2

Step-by-step explanation:

as x goes up on y goes down 3

slope is change in y over change in x

-3/1=-3

the y intercept is (0,2) so the y intercept is +2

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Which values are solutions to the inequality below? check all that apply
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Answer:

Step-by-step explanation:

THE ANSWER IS 9

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