How to write an equivalent expression for n times a using only addition

Mathematics

1 answer:

Zigmanuir [339]3 years ago

7 0

Maybe an answer would be 30=20+n What is the value of the variable?

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Find the surface area of the composite figure.

sdas [7]

Answer:

273.62 cm^2

Step-by-step explanation:

so surface area of a rectangular prism is 7*6 7*2 and 6*2 (this can be used with different numbers, i dont know how to explain it well) this would come out to 68

the trangular prism doesnt have a direct formula, but there are calculators on the internet you can look up, but it would come out to 205.62,

add the numbers together and you would get 273.62cm^2

4 0

3 years ago

A ball is shot straight up from the top of a 15-story building. The motion of the ball could be described by the function: h(t)=

viktelen [127]

Answer:

After 4 seconds the height is 480 meters.
The maximum height is 484 meters.
The ball hits the ground after 10 seconds

Step-by-step explanation:

The height after four seconds is h(4) = -16 * r² + 144*4+160 = 480

The maximum height of the ball is the value it takes at its vertex 'v = -b/2a'. In this case a = -16 and b = 144, so the v = -144/-32 = 4.5. The maximum height of the ball as a result is h(4.5) = -16 (4.5)² + 144*4.5 + 160 = 484

To find the moment the ball hits the ground, we need to find when h takes the value 0 by using the quadratic formula, with a = -16, b = 144 and c = 160.

$r_1,r_2 = \frac{-144 \, ^+_- \sqrt{144^2-4*(-16)*160}}{2*(-16)} = \frac{-144 \, ^+_- \sqrt{30976}}{-32} = \frac{-144 \, ^+_- 176}{-32} = -1, 10$

Since t cant take negative values, then the correct value is 10. The ball hits the ground after 10 seconds.

7 0

3 years ago

Solve. 3(4x + 2x) = 8

shepuryov [24]

If you would like to solve the equation 3 * (4 * x + 2 * x) = 8, you can do this using the following steps:

3 * (4 * x + 2 * x) = 8
3 * 6 * x = 8
18 * x = 8 /18
x = 8/18
x = 4/9

The correct result would be 4/9.

3 0

4 years ago

Read 2 more answers

How many times 36 go into 37?

nikitadnepr [17]

It goes in once with a remainder of 1

3 0

3 years ago

(-8x^4y^2)^2*2x^2y^6 divided by32x^8y^3

Korvikt [17]

Answer:

The answer is 4x^2y^4y^3 simplified to 4x^2y^7