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3 years ago

7. There are 4 times as many boys

Mathematics

1 answer:

Sati [7]3 years ago

7 0

Answer:

There are 7 girls

Step-by-step explanation:

28 divided by 4 equals 7

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5x^2-2x=2 help plsmmm

Yuki888 [10]

Answer:

Presumably you're solving for x here? Without further information we'll assume that.

With that in mind, x is approximately equal to 0.86 and -0.46

Step-by-step explanation:

Let's start by putting it in the usual ax² + bx + c format.

$5x^2- 2x = 2\\5x^2 - 2x - 2 = 0\\$

let's solve it. First we'll multiply both sides by five, making the first term a perfect square:

$25x^2 - 10x - 10 = 0\\$

Now we'll add 11 to both sides:

$25x^2 - 10x + 1 = 11\\$

Which makes the left side a perfect square:

$(5x - 1)^2 = 11$

And now we can solve for x:

$(5x - 1)^2 = 11\\\\5x - 1 = \sqrt{11} \\\\5x = 1 + \sqrt{11}\\\\x = \frac{1 + \sqrt{11}}{5}$

Note that there's no apparent way of drawing the ± symbol when editing equations, so take that + sign as actually being ±.

That gives us two answers:

$x = \frac{1 + \sqrt{11}}{5}\\\\x \approx \frac{1 + 3.32}5\\\\x \approx \frac{4.32}5\\\\x \approx 0.86$ $x = \frac{1 - \sqrt{11}}{5}\\\\x \approx \frac{1 - 3.32}5\\\\x \approx \frac{-2.32}5\\\\x \approx -0.46$

7 0

3 years ago

Question in the picture. PLS HELP!! THANKS + 30 POINTS + BRAINLIEST

Andrej [43]

Answer:

C. Lincoln Forest is at sea level

Step-by-step explanation:

Elevation above sea level is indicated for several points in the table

Positive number indicates points above, negative number indicates points below, zero elevation indicated points at sea level

So, the answer for Lincoln Forest is:

C. Lincoln Forest is at sea level

4 0

3 years ago

The tables below show running hours of three printers that produce greeting cards and the total number of greeting cards produce

AysviL [449]

ANSWER

The correct answer is A

EXPLANATION

To find the ink cost of each card coming from printer B, we need to find the total cost from printer B and the total number of cards printed by Printer B.

The total hours of all the three printers over the three weeks

$=40+45+55+50+50+30+45+40+60=415$

The total hours of printer B only

$=50+50+30=130$

Total number of cards produced over the three weeks

$=7950+7800+9600=25350$

We can use ratio and proportion to determine the total cards produce by printer B only.

$415:25350$

$130:x$

If less, more divides

$x=\frac{130\times 25350}{415} \approx7941$

Total cost of Printer B in 130 hours

$ $=130 \times 15=1950$

The ink cost

$=\frac{1950}{7941}$

$=0.2456$

$ $\approx 0.30$

to 2 decimal places

8 0

4 years ago

Read 2 more answers

The value of x is ___, and the value of y is ___. Please help me out! Thanks! :)

vagabundo [1.1K]

The value of x is 60, as you wrote. The sum of all angles in a triangle is 180°.

The sum of all angles on a straight line is also 180°. So to find y, solve for the third angle of the triangle on the left.

50 + 60 = 110. 180-110 = 70°.

Now we know 2 of the 3 angles along the line (70° and x, 60°)

70 + 60 + y = 180
130 + y = 180
y = 50

Hope this helps. LMK if you have questions.

5 0

3 years ago

Natasha2012 [34]

Two equilateral triangles, but one has sides measuring 3 cm, while the other measures 6 cm. The figures are similar, but not congruent

7 0

3 years ago