2 years ago

Convert the time. Enter your answer in the box. 4 minutes 53 seconds = seconds

Mathematics

1 answer:

Vsevolod [243]2 years ago

3 0

293 seconds ____________

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Martin is taking a test at school. His teacher gave him 1 hour and 15 minutes to complete the test. He has been taking the test

nekit [7.7K]

Converting 1 hour and 15 minutes to minutes only, its 75 minutes. 75 - 54 is 21. So, Martin has 21 minutes left to finish.

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butalik [34]

Answer:

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Step-by-step explanation:

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3 years ago

Which of the following are solutions to 2x2 – 8x - 90? Select all that apply.

Bond [772]

Answer:

x=-5, x=9

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$2x^{2} -8x-90$

equate to zero

$2x^{2} -8x-90=0$

$2=-1\\b=-8\\c=-90$

substitute in the formula

$x=\frac{-(-8)\pm\sqrt{-8^{2}-4(2)(-90)}} {2(2)}$

$x=\frac{8\pm\sqrt{784}} {4}$

$x=\frac{8\pm28} {4}$

$x=\frac{8+28} {4}=9$

$x=\frac{8-28} {4}=-5$

therefore

The solutions are x=-5, x=9

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2 years ago

If magazines cost $0.50 each, how much will 3 magazines cost?

denis23 [38]

What you want to do is do:

0.5 + 0.5 + 0.5 to find how much 3 magazines are.

So, three magazines cost $1.50

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