PLEASE HELP SO I CAN GO EAT LUNCH!!

Mathematics

1 answer:

DENIUS [597]3 years ago

8 0

Answer:

Average low temp. = 6. The fourth number is 9.

Step-by-step explanation:

To find the average of 7 low temperatures, add them and divide the sum by 7.

Average low temp. = (5 + 8 + 6 + 5 + 10 + 7 + 1) / 7 = 42 / 7 = 6

The mean is the average. Call the missing number x.

There are four numbers, three of which are given. Add all the number, including the unknown x, then divide the sum by 4. The result is 7 (given in the problem).

$\frac{5+7+7+x}{4}=7\\\frac{19+x}{4}=7\\19+x=28\\x=9$

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The horizontal line has equation $y=3$ . The line is solid, and everything below it is shaded, which translates to the inequality $y\le3$ . (so not B nor D)

The dashed line must have equation $y=2x-1$ . Because it's dashed, the inequality is strict. Pick any point in the shaded region, (0, 0) for instance, and compare both sides of this equation. (0, 0) means both $x=0$ and $y=0$ , so on the left side we have 0, and on the right we have -1. 0 > -1, so the inequality must be $y>2x-1$ .