3 years ago

5) Dan and Joan were able to clean the attic in 7 hours together, It takes

Mathematics

1 answer:

Contact [7]3 years ago

5 0

Answer:

9 hours im not really good at this but i hope i did my best ^.^ :)

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Which are the roots of the quadratic function f(b) = 62 – 75? Select two options.

elena55 [62]

Answer:

$b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

Step-by-step explanation:

Given

$f(b) = b^2 - 75$

Required

Determine the roots

To get the root of the function, then f(b) must be 0;

i.e. f(b) = 0

So, the expression becomes

$0 = b^2 - 75$

Add 75 to both sides

$75 + 0 = b^2 - 75 + 75$

$75 = b^2$

Take square roots of both sides

$\sqrt{75} = \sqrt{b^2}$

$\sqrt{75} = b$

Reorder

$b = \sqrt{75}$

Expand 75 as a product of 25 and 3

$b = \sqrt{25*3}$

Split the expression

$b = \sqrt{25} *\sqrt{3}$

$b = \±5 *\sqrt{3}$

$b = \±5 \sqrt{3}$

$b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

The options are not clear enough; however the roots of the equation are $b = 5 \sqrt{3} \ or\ b = -5 \sqrt{3}$

4 0

3 years ago

How long does it take an SR-71 Blackbird to make a surveillance run of 10,026 miles if it travels at an average of 2,228 mph

g100num [7]

This is simple division:
$t = \frac{10026}{2228}$

So, plug it into your calculator and you get:
$t = 4.5$

Your answer's that it takes 4.5 hrs for the surveillance run.

4 0

3 years ago

I need the word for this definition..... a number is the product of that number and any whole number

Oxana [17]

The answer to that definition is a multiple. A multiple is any number that is not zero.

Hope I helped!

- Amber

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3 years ago

There are 12 boys in a math class. The total number of students s depends on the number of girls in the class g. write an equati

Pani-rosa [81]

12 + g = s
12 boys + g girls = s students

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3 years ago

WILL MARK BRAINLIST IF HELPSED

Natali [406]

When x = 0 y = a(b)^x = a which is the y intercept
so as the y-intercept = 3 a must be = 3.

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3 years ago