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Andrei [34K]
3 years ago
14

7.

Mathematics
1 answer:
olga_2 [115]3 years ago
6 0

Answer:

D

Step-by-step explanation:

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Dave has $15 to spend on an $8 dollar book and two birthday cards (c) for his friends. How much can he spend on each card if he
Alex_Xolod [135]
If Dave has 15 dollars and must spend 8 dollars of it on a book, then he will have 7 dollars left. If he then buys two of the same cards for his friends, the most he will be able to spend is half of 7 dollars for each of them, which will be 3 dollars and 50 cents. 
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Dave wants to buy a bike for $180. He has $40. Dave mows lawns for $10 per lawn.
LenaWriter [7]

Answer:

180 = 40 + 10x

Step-by-step explanation:

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2 years ago
I need help with math. i attached a pic
wel

Answer:

C

Step-by-step explanation:

This one is quite easy. If you look angle M is slightly obtuse which means that it can't be A or B but it is to small to be D.

7 0
3 years ago
Read 2 more answers
Find the solutions of the quadratic equation -9c² +2 +3 = 0.
Tresset [83]

Given that,

An equation : -9c² +2c +3 = 0

To find,

Find the value of x.

Solution,

We have, -9c² +2c +3 = 0

We can solve it using the formula as follows :

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

Here, a = -9, b = 2 and c =3

Put the values,

c=\dfrac{-2\pm \sqrt{(2)^2-4(-9)(3)}}{2(-9)}\\\\c=\dfrac{-2+\sqrt{(2)^{2}-4(-9)(3)}}{2(-9)}, \dfrac{-2-\sqrt{(2)^{2}-4(-9)(3)}}{2(-9)}\\\\c=-0.47, 0.69

So, the solution are -0.47 and 0.69.

8 0
3 years ago
The volume of a sphere is 2 comma 143.57 m cubed. To the nearest meter​, what is the radius of the​ sphere? Use 3.14 for pi.
miskamm [114]

\bf \textit{volume of a sphere}\\\\ V=\cfrac{4\pi r^3}{3}~~ \begin{cases} r=radius\\ \cline{1-1} V=2,143.57 \end{cases}\implies 2143.57=\cfrac{4\pi r^3}{3}\implies 6430.71=4\pi r^3 \\\\\\ \cfrac{6430.71}{4\pi }=r^3\implies \sqrt[3]{\cfrac{6430.71}{4\pi }}=r\implies \stackrel{\pi =3.14}{7.9999956 \approx r}\implies \stackrel{\textit{rounded up}}{8=r}

7 0
3 years ago
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