Evaluate the expression: (4 * 5)2 – 6 + 3 = (pls help)

Mathematics

1 answer:

Minchanka [31]4 years ago

8 0

(4 * 5)2 - 6 + 3 = 37

Explanation:

(4 * 5) = 20
20 * 2 = 40
40 - 6 = 34
34 + 3 = 37

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Item 8 Solve for x. Use the quadratic formula. 2x2−5x−9=0 Enter the solutions, in simplified radical form, in the boxes.

Lubov Fominskaja [6]

Answer:

5+√97/4

Also 5-√97/4

Step-by-step explanation:

The Quadratic formula is x=-b+-√b^2-4ac/2a

This means that we should plug the values for A B AND C into the formula

We can work out that

A = 2

B=-5

C=-9

Once we have put these into the formula we get

5+√97/4 (all over 4) aka 3.71

Also 5-√97/4 (all over 4) aka -1.21

7 0

3 years ago

Read 2 more answers

What is 5.37 as a mixed number.

Gnom [1K]

Answer: 5.37 as a mixed number is 5 37/100

To write a decimal number as a mixed number, you must separate the whole part of the decimal part:
5.37 = 5 + 0.37 = 5 0.37
And express the decimal part as a fraction:
0.37=37/100
Then:
Answer: 5.37 as a mixed number is 5 37/100

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3 years ago

If y varies directly as x, find the constant of variation if y = 12 when x = 1/3

Mashutka [201]

The constant is 36
because direct variation y/x

4 0

3 years ago

Bars of soap come in packages of 6 and packages of 20. the 6-bar pack costs $7.86, and the 20-bar pack costs $25. which is the b

sattari [20]

6 Pack Price:
divide total price by number of bars in the pack

=$7.86 ÷ 6 bars
=$1.31 per bar

20 Pack Price:

=$25 ÷ 20 bars
=$1.25 per bar

ANSWER: The 20 pack is a better deal with a lower price per bar. The 20 pack is $1.25 per bar. The 6 pack is $1.31 per bar.

Hope this helps! :)

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3 years ago

One number is 7 more than another. The difference between their squares is 161. What are the numbers?

olga nikolaevna [1]

Let's say the numbers are "a" and "b"

now, we know one of them is 7 more than the other, so hmmm let's say "b" is 7 more than "a", so b = a + 7

the difference of their squares is 161, alrite

$\bf a^2-b^2=161\qquad b=a+7\implies a^2-(a+7)^2=161
\\\\\\
a^2-(a^2+14a+49)=161\implies \underline{a^2-a^2}-14a-49=161
\\\\\\
-14a-49=161\implies -49-161=14a\implies -210=14a
\\\\\\
\cfrac{-210}{14}=a$

and surey you know how much that is

now, what's "b"? well, b = a + 7

3 0

4 years ago