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3 years ago

Help! 21 is 70% of what?

Mathematics

2 answers:

natulia [17]3 years ago

8 0

Answer:

21 is 70% of 30

vladimir2022 [97]3 years ago

7 0

The answer is 13.7 i hole it helps

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How to make as much light when power outage

antiseptic1488 [7]

You could use flash lights, or lots of candles. Candles in the dark is truly beautiful.

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3 years ago

What is the product of 2.2 + 0.3d- 4

Novosadov [1.4K]

Hey there!

Firstly, you need combine your like terms

$\bold{2.2AND-4}$
$\bold{0.3d}$ stays the SAME
$\bold{2.2-4=-1.8}$
$\bold{0.3d+(-1.8)}$
Combine the negative and the plus and make a negative symbol
$\boxed{\boxed{\bold{Answer:0.3d-1.8}}}$

Good luck on your assignment and enjoy your day!

~ $\bold{LoveYourselfFirst:)}$

3 0

4 years ago

Read 2 more answers

Calculate the area of the window using the dimensions given in Part A. SHOW YOUR WORK and EXPLAIN YOUR REASONING.

SashulF [63]

The shape of the window is a trapezoid, and the area of the window is 110.88 square feet

<h3>How to determine the area of the window?</h3>

The given parameters are:

Long base = 15.2 feet
Short base = 11.2 feet
Perpendicular height = 8.4 feet

The shape of the window is a trapezoid.

So, the area is:

Area = 0.5 * (Long + Short) * Height

This gives

Area = 0.5 * (15.2 + 11.2) * 8.4

Evaluate

Area = 110.88

Hence, the area of the window is 110.88 square feet

Read more about areas at:

brainly.com/question/21735282

#SPJ1

6 0

2 years ago

What is the value of x in the equation 4(2x + 10) = 0? (1 point)

miskamm [114]

Answer:

x = -5

Explanation:

4(2x + 10) = 0

[ Simplify both sides of the equation ]

4(2x + 10) = 0

(4)(2x) + (4)(10) = 0 [Distribute]

8x + 40 = 0

[ Subtract 40 from both sides ]

8x + 40 − 40 = 0 − 40

8x = −40

[ Divide both sides by 8 ]

8x / 8 = −40 / 8

x = -5

4 0

3 years ago

According to Scarborough Research, more than 85% of working adults commute by car. Of all U.S. cities, Washington, D.C., and New

tamaranim1 [39]

Answer:

The 99% confidence interval for the mean commute time of all commuters in Washington D.C. area is (22.35, 33.59).

Step-by-step explanation:

The (1 - α) % confidence interval for population mean (μ) is:

$CI=\bar x\pm z_{\alpha /2}\frac{\sigma}{\sqrt{n}}$

Here the population standard deviation (σ) is not provided. So the confidence interval would be computed using the t-distribution.

The (1 - α) % confidence interval for population mean (μ) using the t-distribution is:

$CI=\bar x\pm t_{\alpha /2,(n-1)}\frac{s}{\sqrt{n}}$

Given:

$\bar x=27.97\\s=10.04\\n=25\\t_{\alpha /2, (n-1)}=t_{0.01/2, (25-1)}=t_{0.005, 24}=2.797$

*Use the t-table for the critical value.

Compute the 99% confidence interval as follows:

$CI=27.97\pm 2.797\times\frac{10.04}{\sqrt{25}}\\=27.97\pm5.616\\=(22.354, 33.586)\\\approx(22.35, 33.59)$

Thus, the 99% confidence interval for the mean commute time of all commuters in Washington D.C. area is (22.35, 33.59).

8 0

3 years ago