All categories

3 years ago

Please help me with this problem. (7+-12)*9. Thanks

Mathematics

1 answer:

MrRissso [65]3 years ago

5 0

Answer: -45

Step-by-step explanation: According the order of operations, or PEMDAS, we first simplify what's inside the parentheses.

So here, we have 7 + -12 which is -5.

When we are adding a negative, think of it as subtracting a positive so 7 + -12 can be changed to 7 - 12 or -5.

Now, we have (-5) (9).

Since a negative multiplied by a positive gives us a negative, -5 multiplied by 9 will give us an answer of -45.

Therefore, (7 + 12) × 9 = -45.

You might be interested in

Rewrite in simplest radical form square root of x times the fourth root of x. Show each step of your process.

Ipatiy [6.2K]

Answer:

$\sqrt[4] {x^3}$

Step-by-step explanation:

At this point, we can transform the square root into a fourth root by squaring the argument, and bring into the other root:

$\sqrt x \cdot \sqrt[4] x =\sqrt [4] {x^2} \cdot \sqrt[4] x = \sqrt[4]{x^2\cdot x} = \sqrt[4] {x^3}$

Alternatively, if you're allowed to use rational exponents, we can convert everything:

$\sqrt x \cdot \sqrt[4] x = x^{\frac12} \cdot x^\frac14 = x^{\frac12 +\frac14}= x^{\frac24 +\frac14}= x^\frac34 = \sqrt[4] {x^3}$

5 0

2 years ago

What is sn for the arithmetic series with a1=3 an=-38 and n=8?

otez555 [7]

Sn = n/2 (a1+an)
= 8/2 (3-38)
= 4 (-35)
= -140

4 0

3 years ago

What is 20% of 102.84

Mariulka [41]

Answer:

20.568

Step-by-step explanation:

...

5 0

3 years ago

Read 2 more answers

Sam collects baseball cards. He gave 6 cards to his brother. He then got 4 new cards from his father. Sam now has 12 cards. How

JulijaS [17]

Answer:

Step-by-step explanation:

If he had 14 then he gave away 6, he'd have 8. 8 plus 4 is 12. He had 14 before giving any away.

8 0

3 years ago

Read 2 more answers

Factorize<br>3a⁴+18a²-21-2b-3b²

Gnom [1K]

Answer:

the expression is not factorable with rational numbers.

3 0

3 years ago

Read 2 more answers