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madreJ [45]
3 years ago
7

Anyone I’m really lost

Mathematics
1 answer:
Savatey [412]3 years ago
3 0

Answer:

The answer is option 3.

Step-by-step explanation:

You have to substitute H+=2×10^(-9) into the equation of pH :

pH = -log[H+]

H+ = 2×10^(-9)

pH = -log[2×10^-9]

= 8.70 (3s.f)

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The equation is y = -5(3^x)
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Answer:

C

Step-by-step explanation:

Since the number outside of the parentheses is -5, the negative factor means that the line is reflected across the x-axis.

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3 years ago
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liz asked charlie to pick up her up a cup of frozen yogurt. she asked for I need to toppings from the six: chocolate chips, gran
Afina-wow [57]

Step-by-step explanation:

Total toppings = 6

Probability of chocolate chips = 1/6

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3 0
3 years ago
Noah earned v dollars over the summer. Mai earned m dollars, which is 45 dollars more than Noah did.
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What is the question?

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stiks02 [169]

Answer:

F. 23

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3 0
2 years ago
ACCORDING to the rate of electricity charge, the minimum charge up to 20 unit is Rs 80 and the cost per unit from 21 units to 25
azamat

Answer:

180

Step-by-step explanation:

let x = total units of electricity after 250 units

the total units of electricity consumed can be determined using the formula below

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x = 1168 / 7.3

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total electricity consumed = 160 + 20 = 180

160

6 0
2 years ago
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