Ellus

Mathematics

1 answer:

butalik [34]3 years ago

4 0

9514 1404 393

Answer:

2.25

Step-by-step explanation:

Add the square of half the x-coefficient to complete the square.

(-3/2)² = 9/4 = 2.25

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Can anyone explain this to me please

timurjin [86]

Hello there,

To start it off, 2 x 39= 78
So a is correct that would be 2 x 30+9 = 2x39= 78
So b is correct as well. 2 x 40-1= 2 x 39= 78
c is questionable 2 x 30 +9= 60 + 9 = 69
So d is correct 18 + 60 = 78
So e is correct 100-22 = 78

So 2 x 39 is not equal to (2 x 30) +9

Hope this helped!

5 0

3 years ago

Flaky pastry can be made using flour and fat in the ratio 4 : 3. Jake makes some flaky pastry using 90 grams of fat. What weight

lubasha [3.4K]

Answer:

He use 120 grams of flour.

Step-by-step explanation:

Given:

Flaky pastry can be made using flour and fat in the ratio 4 : 3. Jake makes some flaky pastry using 90 grams of fat.

Now, to find the weight of flour he use in making flaky pastry.

Let the weight of flour be $x.$

Weight of fat = 90 grams.

The ratio of flour and fat used in making flaky pastry is 4 : 3.

As, 4 is equivalent to 3.

Thus, $x$ is equivalent to 90.

Now, to solve using cross multiplication method:

$\frac{4}{3} =\frac{x}{90} \\\\By\ cross\ multiplying\ we\ get:\\\\360=3x\\\\Dividing\ both\ sides\ by\ 3\ we\ get:\\\\120=x\\\\x=120\ grams.$

Therefore, he use 120 grams of flour.

4 0

3 years ago

Solve please thanks x+5= the square root of 7x+53

Marina86 [1]

$x+5= \sqrt{7x+53} \\ \\ (x+5)^2= (\sqrt{7x+53} )^2 \\ \\ x^2+10x+25=7x+53 \\ \\ x^2+3x-28=0 \\ \\ (x-4)(x+7)=0 \\ \\ x-4=0 \\ x=4 \\ \\ x+7=0 \\ x=-7 \\ \\ x=-7,4$