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4 years ago

Can someone help me with this 20 points

Mathematics

2 answers:

Novay_Z [31]4 years ago

5 0

Answer:

9cm

8 cm

Step-by-step explanation:

The diameter is 2 times the radius

d = 2r

d = 2(4.5)

d = 9 cm

The diameter is 16cm

d = 2r

16 = 2r

Divide each side by 2

16/2 = 2r/2

8 =r

The radius is 8 cm

Nostrana [21]4 years ago

4 0

1st : to find the diameter just multiply the radius of the circle by 2

2nd: divide the diameter by 2 for the circle so the radius of the circle is 8

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What to numbers can go into 72 and 45

ratelena [41]

Answer:

3 and 9

Step-by-step explanation:

3 * 24 = 72

9 * 8 = 72

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ANEK [815]

Your answer would be

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3 years ago

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The smiths have two children. The sum of their ages is 23. The produce of their ages is 132. How old are the children?

kolezko [41]

For this case we propose a system of equations:

x: Let the variable representing the age of the first child of the Smiths

y: Let the variable representing the age of the second child of the Smiths

According to the data of the statement we have to:

$x + y = 23\\x * y = 132$

From the first equation we have to:

$x = 23-y$

We substitute in the second equation:

$(23-y) * y = 132\\23y-y ^ 2 = 132\\y ^ 2-23y + 132 = 0$

We find the solutions by factoring:

We look for two numbers that, when multiplied, result in 132 and when added, result in 23. These numbers are 11 and 12.

Thus, we have that the factorized equation is:

$(y-11) (y-12) = 0$

Thus, the solutions are: $y_ {1} = 11\\y_ {2} = 12$

So, we can take any of the solutions:

With $y = 11$

Then $x = 23-11 = 12$

Therefore, the ages of the children are 11 and 12 respectively.

Answer:

The ages of the children are 11 and 12 respectively.

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3 years ago

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kobusy [5.1K]

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Answer: 9√3

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3 years ago

Which of the following expressions are equivalent to -19/8 x(-50)

dmitriy555 [2]

1. Move the negative sign to the left.

- $\frac{19}{8}$ $X$ *-50

2. Use this rule: $\frac{a}{b}$ $*$ $\frac{c}{d}$ = $\frac{ac}{bd}$

- $\frac{19x*-50}{8}$

3. Simplify - $\frac{-950x}{8}$

4. Move the negative sign to the left.

-(-950x/8)

5. Simplify 950x/8 to 475x/4

6. Remove parentheses.

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2 years ago