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3 years ago

11

I need help with my math assignment

1 answer:

aleksklad [387]3 years ago

6 0

X+15=102
102-15=x
x=87
Please give me brainliest

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Jack is 10 years old. Kylie is 17 years old. Vanessa is 23 years old. Kylie and Vanessa share £16 in the ratio of their age. Kyl

ser-zykov [4K]

Answer:

£3.66

Step-by-step explanation: if you need it :D

17 + 23 = 40

40 = 16 what about 17

16 × 17 = 272 ÷ 40 = £6.8

16 - 6.8 = £9.2

20% of £6.8 = £1.36

1/4 of £9.2 = £2.3

1.36 + 2.3 = £3.66

Can you mark my answer brainliest? Tysm! :D

-Eli

8 0

3 years ago

Given that 3^x = 4^y = 12^z, show that z = (xy)/(x+y).

irinina [24]

$3^{x} = 4^{y} = 12^{z}$
$3^{x} = 4^{y} = (4 \cdot 3)^{z}$
$3^{x} = 4^{y} = 4^{z} \cdot 3^{z}$

$\text{Let a } = 3^{x} = 4^{y} = 4^{z} \cdot 3^{z}$
$log_3a = x$
$log_4a = y$
$log_{(4 \cdot 3)}a = z$

Using change of base:
$x = \frac{lna}{ln3}$
$y = \frac{lna}{ln4}$
$z = \frac{lna}{ln(4 \cdot 3)}$

$ln3 = \frac{lna}{x}$
$ln4 = \frac{lna}{y}$
$ln(4 \cdot 3) = \frac{lna}{z}$

Now, ln(4 · 3) = ln(4) + ln(3)

$\frac{lna}{z} = \frac{lna}{x} + \frac{lna}{y}$
$\frac{1}{z} = \frac{1}{x} + \frac{1}{y}$
$\frac{1}{z} = \frac{x + y}{xy}$

$\therefore z = \frac{xy}{x + y}$

8 0

4 years ago

If 60 is 75% of a value,what is that value

NISA [10]

80

<span>Using the rule of 3, 60x100% =6000(obviously) and 6000/75 = 80</span>

4 0

3 years ago

Read 2 more answers

Find the measure of the angle indicated. Assume that lines which appear tangent are tangent.

Marat540 [252]

Answer:

$= \frac{1}{2} \times 56 \degree \\ = 28 \degree$

6 0

3 years ago

PLEASE HELP ME<br>SOLVE FOR X

nadya68 [22]

Answer:

x=21.4

Step-by-step explanation:

6 0

3 years ago