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gladu [14]
3 years ago
9

Ralph is 3 times as old as Sara. In 4 years, Ralph will be only twice as old as Sara will be then. Find Ralph's age now. If x re

presents Sarah's age now, which of the following expressions represents Ralph's age in four years?
3x
6x
2x + 4
3x + 4
Mathematics
1 answer:
tino4ka555 [31]3 years ago
3 0

Answer:

2x + 4

Step-by-step explanation:

Let R = Ralph's age

and x = Sarah's age

          Then Ralph's age in 4 years = R + 4

       and Sarah's age in four years = x + 4

Thus,                                       R + 4 = 2(x + 4)

Distribute the 2                      R + 4  =     2x + 8

Subtract 4 from each side     R        =     2x + 4

Ralph's age is 2x + 4.

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F(x) = 5x2 + 20x - 12<br> What is the vertex for this
kifflom [539]

Answer:

10+20x-12

20x-2

X=20-2

X=18

3 0
2 years ago
25 is what percent of 64
Flauer [41]
Make a proportion to find the percent:
25/64 = x/100
Multiply 25 and 100, then divide that answer by 64. Then add a percent symbol.

25*100 =2500
2500/64 = 39.0625
39.0625%
7 0
3 years ago
Please help D:
lawyer [7]
The answer is <span>The sum is 10 · 11.
</span>
The first 10 positive even numbers are:
2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Their sum is:
 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 = 110

Now, let's present it as two factors:
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3 0
3 years ago
Can y’all please help me
Furkat [3]

Answer:

1st blank: 160(2) - 16(2)²

2nd blank: 256

3rd blank: 5

4th blank: 400

5th blank: 10

Step-by-step explanation:

h(x) = -16x² + 160x

To find h(2) just replace x = 2 into the equation

h(2) = 160(2) - 16(2)² = 256 in

The maximum height coincides with the vertex of the parabola.

x-coordinate of the vertex: -b/(2a) = -160/[2*(-16)] = 5

y-coordinate of the vertex: -16(5)² + 160(5) = 400

To hit the ground means h(x) = 0

-16x² + 160x = 0

16x(-x + 10) = 0

x = 0

or

-x + 10 = 0

x = 10

6 0
3 years ago
PLEEEEEEEEAAAAAAAAASSSSSSSE HELP ASAPPPPP!!!! WILL NAME BRAINLIEST!!! (HINT to get brainiest from me: please help with all five
Anuta_ua [19.1K]

Answer:

1        <u>6</u>

2     10

3     \frac{18}{5}

4     \frac{8}{3}

5     5

Step-by-step explanation:

7 0
3 years ago
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