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3 years ago

Select the correct answer from each drop-down menu.

Mathematics

1 answer:

andreyandreev [35.5K]3 years ago

4 0

Answer:

Well, 1 is 3.8 The second one is 40,

Step-by-step explanation:

I believe 1 is 3.8, b/c 1.9*2 is 3.8, and the difference between exponents makes 3 zeros, so 2000.

The second one is 40, I confirmed this by doing .0001 to replicate 10 to the negative 4th power

By doing 9.5*.0001*40, I got the 0.038 from 1

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What is the expression in simplest radical form?<br> 4V90

cluponka [151]

Answer:

please check your question again

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3 years ago

PLS HELP Anna buys bananas and apples. She buys 2 more apples than twice the number

Alecsey [184]

Answer:

You have to put this in a bar model yourself so convert it later

She bought 10 apples

Step-by-step explanation:

3x + 2 = 14

why i did this

because she bought 2 times the amount of bananas, it should be x + 2x = 3x

then i added two because she bought two extra apples

so 3x+2 = 14

subtract 2

3x = 12

x = 4

So now we substitute x in apples

2x +2 = # of apples

8 +2 = 10

check

10 - 2 = 8

8/2 = 4

4 = # of bananas

4 0

3 years ago

Read 2 more answers

a particular strain of bacteria doubles in population every 10 minutes. Assuming you start with a single bacterium in a petri di

ser-zykov [4K]

Answer:

C. 32,768

Step-by-step explanation:

Step 1

Convert the number of hours to minutes

2.5 hours to minutes = 2 hrs 30 minutes to minutes is calculated as

1 hour = 60 minutes

2 hours 30 minutes =

Cross multiply

(60 minutes × 2 hours) + 30 minutes = 150 minutes.

Step 2

We are told in the question that the bacteria population doubles every 10 minute interval

Find the number of intervals in 150 minutes

= 150 minutes / 10 minutes interval

= 15 intervals

Step 3

The number of bacteria present after 2.5 hours is calculated using the formula of

= Amount of bacterium × 2ⁿ

Where n = number of intervals = 15

Amount of bacterium = single bacterium = 1

Number of bacteria = 1 × 2¹⁵

= 32,768

Therefore, when you start with a single bacterium in a petri dish, the number of bacteria that will there be in 2.5 hours is 32,768

6 0

3 years ago

A researcher has saline solutions with concentrations of 3% and 7%. He wants to mix some of each solution to get 64 milliliters

777dan777 [17]

Answer:

We have 3% and 7% solutions. (We'll call these x and y)

We need 64 ml of 6% solution.

Setting up two equations:

A) x + y = 64 ml

B) .03x + .07y = (.06 * 64)

Multiplying A) by -.03

A) -.03x -.03y = -1.92 then adding this to B)

B) .03x + .07y = 3.84

.04y = 1.92

y = 1.92 / .04 = 48 ml of 7% solution

x = 16 ml of 3% solution

DOUBLE-CHECK

16 * .03 + 48 * .07 = 3.84 ml in 64ml

3.84 / 64 = .06 per cent!!

Source: https://www.1728.org/mixture.htm

Step-by-step explanation:

7 0

3 years ago

A tree has a shadow that is 9 feet long. Otis is 4 feet tall, and he is standing next to the tree. Otis has a shadow that is 4.5

enot [183]

Explanation:

The correct answer is: The height of the tree is 8 feet (or <em>the tree is 8 feet tall</em>).

Explanation:

Please see the picture attached with the same.

Given Data:

Tree's shadow is 9 feet long.

Otis is 4 feet tall.

Otis' shadow is 4.5 feet long.

We need to find out how tall the tree is.

The ratios of both of their height and their shadows should be the same, as follows:

$\frac{x}{4} = \frac{9}{4.5} \\x = \frac{9*4}{4.5}\\ x = 8 \thinspace feet$

The tree is 8 feet tall.

-i

6 0

3 years ago

Read 2 more answers