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schepotkina [342]
2 years ago
10

MIDDLE SCHOOL

Mathematics
1 answer:
Lyrx [107]2 years ago
8 0
$39.99 • .07= 2.7993. 2.7993+$39.99= $42.79.
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24 students in a class took an algebra a test. If 18 students passed the test what percent passed?
stiks02 [169]

Answer:

75% of students passed

Step-by-step explanation: divide 18 by 24 to find the precentage

5 0
3 years ago
Read 2 more answers
the ratio of sallys height is 7:8. if the sum of their heights is 90 inches. how tall are sally and jack?
pickupchik [31]

Answer:

Sally is 42 in. tall, and Jack is 48 in. tall.

Step-by-step explanation:

There are some words missing in the problem.

Perhaps the problem was meant to read:

"The ratio of Sally's height to Jack's height is 7:8. If the sum of their heights is 90 inches, how tall are Sally and Jack?"

Solution:

The ratio of the heights is 7:8.

Sally could measure 7 inches and Jack 8 inches, but then when you add the heights, 7 in. + 8 in. = 15 in. which is not 90 inches.

If you multiply both numbers in a ratio by the same number, the new numbers are still in the same ratio.

Multiply 7 and 8 by 2. You get 14 and 16. Maybe Sally is 14 in. tall and Jack is 16 in. tall. Add the heights, 14 in. + 16 in. = 30 in. This is also not 90 in.

We can keep on guessing what number to multiply by 7 and 8 by so their sum is 90, but we can use algebra to write an equation and not have to go through many guesses.

There is a number, x, that when you multiply 7 and 8 by x, the sum of the products is 90. We don't know what x is, but we can write an equation and solve for x.

The numbers in the ratio are 7x and 8x.

7x and 8x are still in the ratio 7:8.

Now we add the numbers 7x and 8x and set the sum equal to 90. Then we solve for x.

7x + 8x = 90

15x = 90

x = 6

We get x = 6. Now we know we need to multiply both 7 and 8 by 6 to get the heights we need.

7 in. * 6 = 42 in.

8 in. * 6 = 48 in.

Check: 42 in. + 48 in. = 90 in.

Answer: Sally is 42 in. tall, and Jack is 48 in. tall.

7 0
2 years ago
Prove that ABCD is a rectangle.<br> A = (-4, 4)<br> B = (0,5)<br> C = (1, 1)<br> D = (-3,0)
kaheart [24]

Answer:

Draw it on a graph sheet

5 0
2 years ago
Read 2 more answers
What is 38 ÷ 1,558 equal to ?
Wittaler [7]
The answer is about 0.02439.
I simply just put it into the calculator.
4 0
3 years ago
Forty-eight is <br> a0% of 60.
Sunny_sXe [5.5K]
48/60 = .8 

This means 80% of 60 is equal to 48. 

Thus, a0% = 80%

and we can determine that a = 8. 
7 0
3 years ago
Read 2 more answers
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