3 years ago

sally is y years old mike is the difference between 20 and Sally's age Joe is four years less than triple Sally's age

Mathematics

1 answer:

Vitek1552 [10]3 years ago

4 0

Can you get a dotted chart

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2.Solve the following quadratic equations<br> i. 9x^2 - 1/16<br> ii. 2h^2 - 3h - 27

Juli2301 [7.4K]

$i)~9x^2-\dfrac{1}{16}=0\iff9x^2=\dfrac{1}{16}\iff x^2=\dfrac{1}{9\cdot16}\iff \\\\x^2=\dfrac{1}{144}\iff x=\pm\sqrt{\dfrac{1}{144}}=\pm\dfrac{1}{12}\Longrightarrow\boxed{x=\pm\dfrac{1}{12}}$

$ii)~2h^2-3h-27=0\\\\\Delta=b^2-4ac\to \Delta=(-3)^2-4\cdot2\cdot(-27)\to\Delta=9+216=225\\\\
\Longrightarrow h=\dfrac{-b\pm\sqrt{\Delta}}{2a}=\dfrac{-(-3)\pm\sqrt{225}}{2\cdot2}=\dfrac{3\pm15}{4}\\\\\begin{cases}h_1=\dfrac{3+15}{4}=\dfrac{18}{4}\iff \boxed{h_1=\dfrac{9}{2}}\\h_2=\dfrac{3-15}{4}=\dfrac{-12}{4}\iff\boxed{h_2=-3}\end{cases}$

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3 years ago

I need help please?!!!!!!

Vadim26 [7]

Answer:

simplified is

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Step-by-step explanation:

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3 years ago

A square park has an area of 1/16 square miles and a length of 1/4 mile. What is

Radda [10]

9514 1404 393

Answer:

1/4 mile

Step-by-step explanation:

The length and width of a square are the same.

The length is 1/4 mile, so the width of the park is 1/4 mile.

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2 years ago

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Maria receivesa commission of 11.5%for each pair of shoes she sells.She earned $207 in commission last week.What was the dollar

Kamila [148]

Answer:

$1800

Step-by-step explanation:

You would use proportions. 11.5/100 (11.5%) multiplied by 207/x.

Cross multiply 100 and 207, then divide that answer by 11.5. You should get 1,800 as your answer.

Therefore, the dollar amount of shoes that Maria sold is $1800.

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3 years ago

What are Factor pairs of 21 x squared

Serhud [2]

21x^2

you CAN'T factor 21x^2

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3 years ago

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