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andrey2020 [161]
3 years ago
10

Please I need help for real

Mathematics
1 answer:
alina1380 [7]3 years ago
5 0
Y=-3x-5 is the answer !!
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F(x)=2x^2-5;find when f(x)=-7​
Daniel [21]

Answer:

x=i or no solution exists depending on the user's grade

Step-by-step explanation:

f(x) = 2x^2-5

-7 = 2x^2-5

-2 = 2x^2, x^2=-1, x=i

6 0
2 years ago
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Wich expression can be used to find the slope of a line containing the points (-3,2) and (7,-1)
docker41 [41]
A(x_1;\ y_1);\ B(x_2;\ y_2)\\\\\text{The slope:}\ m=\dfrac{y_2-y_1}{x_2-x_1}


\text{We have:}\\(-3;\ 2)\to\ x_1=-3;\ y_1=2\\(7;\ -1)\to x_2=7;\ y_2=-1

\text{substitute}\\\\m=\dfrac{-1-2}{7-(-3)}=\dfrac{-3}{10}=-\dfrac{3}{10}
6 0
3 years ago
How many runners ran fewer than 4 km?
Vinvika [58]
10 runners ran fewer than 4 km 
4 0
3 years ago
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If you want to buy an item in a store that cost $43 and is on sale for 40% off, then how much would the item actually cost you a
expeople1 [14]

Answer:

$25.80

Step-by-step explanation:

40% = 40/ 100 = 4/10 = 0,4

There is a 40% discount, which means that the amount multiplied by more then 1 (for example 1,4) would increase the amount... That isn't right because it is a discount!

So you need to subtract the 40%, so (1 - 0.4 =) 0.6

The amount multiplied by 0.6 will be the correct amount, being $43 * 0.6 = $25.80 (rounded to the nearest cent).

The amount the item actually cost after the discount is $25.80

4 0
3 years ago
Are the ratios 4:9 & 12:18 equivalent?
Zigmanuir [339]
No they aren't because they both can't be multiple by the same number
7 0
3 years ago
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