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2 years ago

Brainliest if correct

Mathematics

1 answer:

allochka39001 [22]2 years ago

7 0

Answer:

u = -2

Step-by-step explanation:

Rearrange terms

-10 = -4 + 3u

-10 = 3u-4

Add 4 to both sides of the equation

-10 = 3u - 4

-10 +4 = 3u-4 +4

Simplify

-6 = 3u

Divide both sides of the equation by the same term

-6/3 = 3u/3

Simpilfy

u = -2

[RevyBreeze]

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The Sears Tower, at 1,451 feet, is one of the tallest structures in the United States. A penny is thrown from the top of the tow

padilas [110]

Answer:

The equation for the height of the penny in function of time is:

$h(t)=1451-16t^2$

After 7 seconds, the penny will be at a height of 667 feet.

Step-by-step explanation:

The penny will have a free fall.

The initial velocity is zero, and the initial height is h(0)=1,451.

The acceleration will be the gravity, that has a value g=32 ft/s^2.

Then, we can model this starting by the speed:

$dv/dt=-g\\\\v(t)=v_0-gt=-gt$

Then, the height becomes:

$dh/dt=v(t)=-gt\\\\h(t)=h_0-\dfrac{gt^2}{2}=1451-\dfrac{32}{2}t^2\\\\\\h(t)=1451-16t^2$

The approximate height of the penny after 7 seconds can be calculated as:

$h(7)=1451-16(7^2)=1451-16*49=1451-784=667$

After 7 seconds, the penny will be at a height of 667 feet.

6 0

3 years ago

Someone help me pls

butalik [34]

the answer is A

5^-8 × 5^4= 5^-8+4

= 5^-4

= 1/5^4

8 0

3 years ago

20% of what number is 1

vova2212 [387]

Answer:

Step-by-step explanation:

this is what I do, I see how many times 20 can go into 100, that is 5 times. and sense the mystery numbers 20% is 1, you can just leave it at 5. To double check your answer, count 1 5 times. 1 goes into 5 5 times, and 20 goes into 100 5 times.

5 0

3 years ago

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Please help (picture)

givi [52]

A = 360 cm^2

Step-by-step explanation:

Using Pythagorean theorem, the length AB is given by

AB^2 = 17^2 - 8^2 = 225 cm^2

AB = 15 cm

Since the ratio BC: CD = 1:2 and BC = 8 cm, this means that CD = 2×(8 cm) = 16 cm

so the length BD is

BD = BC + CD = 8cm + 16 cm = 24 cm

There the area of the rectangle is

A = AB×BD

= 15cm×24cm

= 360 cm^2

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3 years ago

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Look at the diagram. If RS= 8y + 4, ST = 4y + 8, and RT = 36, find the value of y.

vladimir2022 [97]

<span>RS= 8y + 4, ST = 4y + 8, and RT = 36

RS + ST = RT
</span>8y + 4 + 4y + 8 = 36
12y + 12 = 36
12y = 24
y = 2

answer
y = 2 (first choice)

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4 years ago

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