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Lina20 [59]
2 years ago
11

Can you please help me with this question

Mathematics
1 answer:
Degger [83]2 years ago
5 0

Answer:

  B

Step-by-step explanation:

The table that represents a function will have <em>no x-values repeated</em>.

  A. 4 is repeated -- not a function

  B. all x-values are unique -- this is a function

  C. 2 is repeated -- not a function

  D. 3 is repeated -- not a function

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Work out 2/3 X 2 plz help
Romashka [77]
 \frac{2}{3} × 2
2 = \frac{2}{1}

Numerator × numerator
Denominator × denominator

\frac{2}{3} × \frac{2}{1}
\frac{4}{3}
7 0
3 years ago
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
Brandon uses the steps below to solve the equation 15x +6 = 14x +5 using algebra tiles.
Fed [463]

Answer:

D. Brandon is not correct because he should have added 6 negative unit tiles to isolate the variable in step 2

Step-by-step explanation:

Key goal is to have x on one side while the other value to the right. By subtracting 14x on both sides, you would get x+6=5. You would finally subtract 6 on both sides, not 5, to get the x by itself, thus x=-1.

6 0
3 years ago
Read 2 more answers
The head of a nail is circular, as shown. The head of this nail has a diameter of 6 millimeters.
Tcecarenko [31]

Answer:

its A

Step-by-step explanation:

Hope it helps

6 0
3 years ago
Work out the volume of this sphere?
Elina [12.6K]

Answer:

434.9

Step-by-step explanation:

\frac{4}{3} × π (4.7)²

434.893

4 0
3 years ago
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