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3 years ago

Please Evaluate 8(12+7-9)

2 answers:

5 0

Distribute 8 to all of your numbers inside of the parentheses first, and then add and subtract all of your numbers together to get 80.
8(12+7-9)
96+56-72
152-72
80

OR...

Do what's inside the parentheses first, which equals 10. Then multiply that by 8 and get the same answer. 80.

Drupady [299]3 years ago

3 0

You distribute 8 into all the numbers which would be 8×12, 8×7, and 8×9. So the answer would be 96+56-72. Hope that helps.

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If a certain cannon is fired from a height of 8.8 meters above the ground, at a certain angle, the height of the cannonball ab

Dennis_Churaev [7]

Answer:

It would take approximately 6.50 second for the cannonball to strike the ground.

Step-by-step explanation:

Consider the provided function.

$h(t)=-4.9t^2+30.5t+8.8$

We need to find the time takes for the cannonball to strike the ground.

Substitute h(t) = 0 in above function.

$-4.9t^2+30.5t+8.8=0$

Multiply both sides by 10.

$-49t^2+305t+88=0$

For a quadratic equation of the form $ax^2+bx+c=0$ the solutions are: $x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Substitute a = -49, b = 305 and c=88

$t=\frac{-305+\sqrt{305^2-4\left(-49\right)88}}{2\left(-49\right)}=-\frac{-305+\sqrt{110273}}{98}\\t = \frac{-305-\sqrt{305^2-4\left(-49\right)88}}{2\left(-49\right)}= \frac{305+\sqrt{110273}}{98}$

Ignore the negative value of t as time can't be a negative number.

Thus,

$t=\frac{305+\sqrt{110273}}{98}\approx6.50$

Hence, it would take approximately 6.50 second for the cannonball to strike the ground.

6 0

3 years ago

The Mary boat cruise line charges a non-refundable fee of $150 and a fee of $280 a day on the cruise ship. The Billy Boat cruise

White raven [17]

You would set it up like this: 150x + 280 = 255x The you just solve.

8 0

3 years ago

Which relationship is always true for the angles RXY and Z or the triangle ABC

aksik [14]

Answer:

the answer is

x + y + z = 180 degrees

proof

the sum of all angles in the triangles is always equal to 180 degrees

Step-by-step explanation:

8 0

3 years ago

The library charges $2 to use the copier and $0.99 for each paid copied.if Jerry paid the librarian $8.93 ,how many copies did H

alexandr402 [8]

First subtract the 2 dollars then you will have 6.39 then divid by the .99 wich gives you 6.45 which you round up to 7 copious because you can’t have a 1/2 of a copy

6 0

3 years ago

Read 2 more answers

Please brainliest and 50 points a blueprint of a room drawn in a coordinate plane, using an appropriate scale

Inga [223]

Answer:

x= 45

Step-by-step explanation:

90-45=x

3 0

3 years ago