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3 years ago

Calculate: 0.3 of 14

Mathematics

2 answers:

jasenka [17]3 years ago

8 0

100% --> 14

30% --> x

100x = 420

x= 420/100

x=4.2

Ber [7]3 years ago

7 0

Answer:

The answer is 4.2

Step-by-step explanation:

Always remember that when they use the word of, it means you have to multiply. So 14 times 0.3 is 4.2

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A karate instructor earns $165 for teaching 3 classes. The instructor receives a 10% raise. How much the instructor earns, in do

Zarrin [17]

Answer:

A $60.50

Step-by-step explanation:

165 divided 3 = $55.00 per class

55.00 X 10% = 5.50 per class

55.00 + 5.50 = 60.50

8 0

3 years ago

Use the fact that 2 1/2 divide 1/8 =20 to find 2 1/2 divide 5/8

Tasya [4]

Answer:

Step-by-step explanation:

Given that $2\frac 1 2 \div \frac 1 8 =20$

$\Rightarrow \frac 5 2 \div \frac 1 8 =20$

$\Rightarrow \frac 5 2 \times 8 1 =20 \cdots(i)$

Now, $2\frac 1 2 \div \frac 5 8$ $= \frac 5 2 \div \frac 5 8$ $=\frac 5 2 \times \frac 8 5$

This can be written as

$\frac 5 2 \times \frac 8 5=\frac 5 2 \times \left( \frac 8 1 \times \frac 1 5\right)$ [as $\frac 8 5=\frac 8 1 \times \frac 1 5$ ]

$=\left(\frac 5 2 \times \frac 8 1 \right)\times \frac 1 5$

$=20 \times \frac 1 5$ [ by using equation (i)]

Hence, $2\frac 1 2 \div \frac 5 8=4$

7 0

2 years ago

Approximately how many times greater is 8.5×10^8 than 3.4×10^5

Greeley [361]

850000000 /<span>340000 = 2,500 times</span>

7 0

4 years ago

Read 2 more answers

What is the obtuse angle formed by hand of a clock at 9:10

zubka84 [21]

Answer:

it would be 60 degrees

Step-by-step explanation: Every 5 minutes on a clock there is a big number, and there are 12 of those. 360/12 is 30 degrees, so every hour, the hour hand moves 30 degrees.

4 0

2 years ago

Find the minimum y-value on the graph of y=f(x)<br><br> F(x) = 7x^2 + 7 - 6

Kisachek [45]

Answer:

The minimum y-value is

$y=-\frac{31}{4}$ or $y=-7.75$

Step-by-step explanation:

we have

$f(x)=7x^{2}+7x-6$

This is the equation of a vertical parabola open up

The vertex is the minimum y-value on the graph

Convert the equation into vertex form

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$f(x)+6=7x^{2}+7x$

Factor the leading coefficient

$f(x)+6=7(x^{2}+x)$

Complete the square. Remember to balance the equation by adding the same constants to each side

$f(x)+6+1.75=7(x^{2}+x+0.25)$

$f(x)+7.75=7(x^{2}+x+0.25)$

Rewrite as perfect squares

$f(x)+7.75=7(x+0.5)^{2}$

$f(x)=7(x+0.5)^{2}-7.75$ ------> equation in vertex form

The vertex is the point (-0.5,-7.75)

therefore

The minimum is the point (-0.5,-7.75)

The minimum y-value is $y=-7.75=-7\frac{3}{4}=-\frac{31}{4}$

see the attached figure to better understand the problem

6 0

3 years ago