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4 years ago

How can I solve this problem

Mathematics

2 answers:

mart [117]4 years ago

7 0

I would say 36 and 49.

Alex Ar [27]4 years ago

4 0

36 and 49

6*6= 36
7*7= 49

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How do you solve 7x-5=30?

Nadya [2.5K]

7x - 5 = 30

* add 5 to both sides

7x = 30 + 5

7x = 35

* divided both sides by 7

(7/7)x = 35/7

<u><em>x = 5</em></u>

8 0

3 years ago

Read 2 more answers

A race car can reach a speed of 185 miles per hour. How fast is that in feet per second?

snow_lady [41]

The car can go exactly 271.3333333333333 feet per second. you are welcome.

3 0

3 years ago

PLEASE HELP ASAP! D;

Oksi-84 [34.3K]

The distance will be 7 units.

Hope it helps!

3 0

3 years ago

The function f(x)=70n -400 models the profit of the instructor of a guitar class per month, where n is the number of students en

Ymorist [56]

Answer:

At least 6 students must be enrolled in the class for the instructor to make a profit.

At least 20 students must be enrolled in the class for the instructor to make $1,000 (or more) profit per month.

Step-by-step explanation:

The function $f(x)=70n -400$ models the profit of the instructor of a guitar class per month.

1. If the instructor makes a profit, then

$f(x)>0\\ \\70n-400>0\\ \\7n-40>0\\ \\7n>40\\ \\n>\dfrac{40}{7}\\ \\n>5\dfrac{5}{7}$

So, at least 6 students must be enrolled in the class for the instructor to make a profit.

2. If the instructor needs to make 1,000.00 profit per month, then

$f(x)\ge 1,000\\ \\70n-400\ge 1,000\\ \\7n-40\ge 100\\ \\7n\ge 140\\ \\n\ge \dfrac{140}{7}\\ \\n\ge 20$

So, at least 20 students must be enrolled in the class for the instructor to make $1,000 (or more) profit per month.

5 0

4 years ago

The sun burns 6 million tonnes of hydrogen a second. Calculate how many tonnes of hydrogen it burns a year (that's 365.25 days)

Illusion [34]

Your answer is 189,345,600,000,000 tons per year

There are 86,400 seconds in a day, and 365.25 days in a year. So 86,400*365.25= 31,557,600 seconds per year. Now if each second the sun burns 6 million tons we have to multiply that by the number of total seconds per year. So 31,557,600 * 6,000,000= 189,345,600,000,000 hydrogen tons per year.
Hope this helped :)

4 0

3 years ago