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2 years ago

Help please these questions are kinda hard do i am giving 15 points

Mathematics

2 answers:

Rudiy272 years ago

8 0

9=6y + 33 the answer is y=−4

the next one is x=10

Step-by-step explanation:

Brut [27]2 years ago

5 0

Answer:

hope it helped u :)

Step-by-step explanation:

$9 + 6y = 33\\6y = 33 - 9\\6y = 24\\y = 4\\\\\\-4(2-1.2x) = 40\\-8 + 4.8x = 40\\4.8x = 48\\x = \frac{48}{4.8} = \frac{48 \times 10}{48} = 10$

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A football is kicked from the ground and follows the graph of the function y = –t2 + 3t, where y represents height and t represe

vesna_86 [32]

Answer:

The height of the objects are the same after 2 seconds.

Step-by-step explanation:

In order to calculate at which time both objects have the same height we need to find the value of t that makes both equations equal. Therefore:

$-t^2 + 3t = -t + 4\\t^2 - 3t - t + 4 = 0\\t^2 - 4t + 4 = 0\\t_{1,2} = \frac{-(-4) \pm \sqrt{(-4)^2 - 4*1*4}}{2*1} = \frac{4 \pm \sqrt{16 - 16}}{2}\\t_{1,2} = \frac{4}{2} = 2$

The height of the objects are the same after 2 seconds.

8 0

2 years ago

If the length of FG is 6 units, what is the length of EH?

QveST [7]

FG goes through the center of the circle, so FG is diameter.

$d = 2r \\ r = \dfrac{d}{2} \\ \\ r = \dfrac{6}{2} = 3$

EH=r=3

Answer: EH=3

4 0

2 years ago

Three numbers are in the ratio 6:3:1, and the sum of these numbers is 420. If the first number is reduced by 50%, and the second

Naily [24]

$x:y:z\ \ \ \Leftrightarrow\ \ \ 6:3:1\\ \\ \frac{x}{z} =\frac{6}{1}\ \ \ \Rightarrow\ \ \ x=6z\ \ \ \ \ \ \ and\ \ \ \ \ \ \ \frac{y}{z} =\frac{3}{1}\ \ \ \Rightarrow\ \ \ y=3z\\ \\x+y+z=420\ \ \ \Rightarrow\ \ \ 6z+3z+z=420\ \ \ \ \Rightarrow\ \ \ \ 10z=420\ /:10\\ \\z=42\ \ \ \Rightarrow\ \ \ \ x=6\cdot42=252\ \ \ \ and\ \ \ \ y=3\cdot42=126\\ \\ \\a=x-50\%x=50\%x= \frac{1}{2} \cdot252=126=3\cdot42\\ \\b=y+42=126+42=168=4\cdot42\\ \\c=420-126-168=126=3\cdot42\\ \\a:b:c\ \ \ \Leftrightarrow\ \ \ 3:4:3$

7 0

2 years ago

Can someone solve number 6, and show your work plz

Romashka [77]

Answer:

3.9 kg

Step-by-step explanation:

total mass = (number of nails) * (mass of one nail)

total mass = 750 * 5.2 * 10^(-3) kg

total mass = 750 * 0.0052 kg

total mass = 3.9 kg

6 0

2 years ago

|3x-7| + 7 = 9 What is the first solution? Plzzz help

posledela

Answer:

3 and 5/3

Step-by-step explanation:

Solving in steps:

|3x-7| + 7 = 9
|3x-7| = 2

1. If 3x - 7 > 0

3x - 7 = 2
3x = 9
x = 3

2. If 3x - 7 < 0

3x - 7 = -2
3x = 5
x = 5/3

5 0

2 years ago