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3 years ago

The product of x and 7 is at least 21

Mathematics

2 answers:

Natali [406]3 years ago

8 0

It’ll be 3

7 x 3 = 21

avanturin [10]3 years ago

4 0

3 or greater. You could replace x with any number greater than 3, and your product would be at least 21. I hope this helps :)

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Kate decides to replace all the lights in her college apartment with energy saving light bulbs beginning this month. The packagi

tatyana61 [14]

Answer:

Kate's electric bill will be $9 for this month for bulb use only.

Step-by-step explanation:

Given:

Electricity bill lass month from bulb use = $12

Using new bulbs percent decrease in electricity = 25%

We need to find this month electric bill for bulb use.

Solution:

First we will find the reduction in bill after using new bulbs.

reduction in bill after using new bulbs can be calculated by percent decrease in electricity using new bulb multiplied by last month Electricity bill from bulb use only.

framing in equation form we get;

reduction in bill after using new bulbs = $\frac{25}{100}\times 12 =\$3$

Now we will find this month electric bill for bulb use only.

this month electric bill for bulb use only can be calculated by subtracting reduction in bill after using new bulbs from last month electric bill for bulb use only.

framing in equation form we get;

this month electric bill for bulb use only = $\$12-\$3=\$9$

Hence Kate's electric bill will be $9 for this month for bulb use only.

3 0

2 years ago

I just can't do this

Roman55 [17]

You can, it's not as hard as you might think

simply multiply the speed by the fraction of time

23 × 1/5 = 23/5 = 4 3/5 = 4.6

$4.6 \: miles$

4 0

2 years ago

In a class, 42 students, there are 8 more boys than girls write and solve a system of 3 equations

zhenek [66]

Answer:

x = 17

Step-by-step explanation:

x + x + 8 = 42 because x = boys and x + 8 = girls

2x = 34 because 2x = 42 - 8

x = 17

i hope this helps! you don't need the 2x = 42 - 8 to be an equation ;)

8 0

3 years ago

NEED HELP ASAP!!!<br><br> Write 18/7 as a mixed number

Kryger [21]

Answer:

Your answer is 2 4/7.

Step-by-step explanation:

Hope this helps!

7 0

2 years ago

Read 2 more answers

A newspaper found that, on average, 7.6% of people stay overnight in the hospital with a 1.5% margin of error. Construct a 95% c

tensa zangetsu [6.8K]

Given:
p = 7.6% = 0.076, the percentage of people who stay overnight at the hospital.
E = 1.5% = 0.015, margin of error
95% confidence interval.

The standard error is
Es = $\sqrt{ \frac{p(1-p)}{n} }$
where
n = the sample size.

The margin of error is
$E=z^{*}E_{s}$
where
z* = 1.96 at the 95% confidence level.

Because the margin of error is given, there is no need to calculate it.
The 95% confidence interval is
p +/- E = 0.076 +/- 0.015 = (0.061, 0.091) = (6.1%, 9.1%)

Answer:
The 95% confidence interval is between 6.1% and 9.1%.

3 0

3 years ago