Please help me with this

Mathematics

1 answer:

harkovskaia [24]3 years ago

5 0

Answer:

<u>The answer is 1. 64 and 2. 60</u>

Step-by-step explanation:

Question 7. 75% of what number is 48?

Number = x

75%x = 48

3x/4 = 48 (75% = 3/4)

3x = 192 (Multiplying by 4 at both sides of the equation)

<u>x = 64</u> (Dividing by 3 at both sides of the equation)

<u>Part 75 Whole 48 Part 100 Whole 64</u>

Question 8. 120% of what number is 72?

Number = x

120%x = 72

12x/10 = 72 (120% = 12/10)

12x = 720 (Multiplying by 10 at both sides of the equation)

<u>x = 60</u> (Dividing by 12 at both sides of the equation)

<u>Part 120 Whole 72 Part 100 Whole 60</u>

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I'd like help with the bottom two questions. Thanks! (7 and 8)

BabaBlast [244]

I have the answer for the first question, the second one idk how to do. To solve mean add all the numbers and divide by how many there are. 300/5 = 60 so that is the mean. For standard deviation subtract mean from every number in the list and square it. 225, 100,0, 25, and 225. Average these numbers and you will get the standard deviation of 115. Im sorry I cant do the second question but I hope this helped for the first one.

5 0

3 years ago

Please help!!

Flura [38]

<h3>Answer: $(28, 91) \cup (93, 94)$ </h3>

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Explanation:

Check out the diagram below.

I have drawn out two number lines with the key points 28,91,93,94 marked on them. The diagram isn't to scale, but that doesn't matter. All that matters is that the numbers line up (eg: we have the two 28's line up vertically).

The first number line drawing on top shows the shading for set A. Everything in the shaded region is either smaller than 91, or larger than 93, or 93 itself. We exclude 91 due to the curved parenthesis. The square bracket says to include the 93.

For the second graph, you have two endpoints as open holes (to exclude both endpoints) and you shade everything between.

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After you draw the two number line regions, you would then mark off the interval(s) that they share in common.

The notation $A \cap B$ means "A intersect B" which means we want to find the stuff that is in both sets at the same time.

So we'll have two pieces here. The portion from 28 to 91 is the first interval, and then the second portion runs from 93 to 94. For each interval sub-piece, the endpoints are excluded

So that leads to the final answer $(28, 91) \cup (93, 94)$