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quester [9]
3 years ago
8

Help me ASAP please!!!

Mathematics
2 answers:
Tom [10]3 years ago
5 0
7.

Hope this helps :)!
Arte-miy333 [17]3 years ago
4 0

Answer:

7

Step-by-step explanation:

The two angles + 90 degrees equals 180 degrees

So it is sufficient to say that the two angles equals 90 degrees

6r - 7 + 55 = 90

6r + 48 = 90

6r = 42

r = 7

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John got a 76, 68, and 83 on his first three test. What score does he need on his fourth test to achieve an 80 average?
shepuryov [24]
It's 93.
simple calculate it by:
(76+68+83+x)/4=80
then 73*5-(67+75+73+69)=x
where x here is the grade needed to reach an av. of 80. 4 is the number of tests.
*common answer*
3 0
3 years ago
Here are two similar rectangles.
asambeis [7]

Answer:

40.32cm^{2}

Step-by-step explanation

4*1.2=4.8

7*1.2=8.4

8.4*4.8=40.32

7 0
3 years ago
If y=6 when x=15 then which of thr following is the value of x when y=20
denis23 [38]

Answer:

if you meant x times y...

15 x 20 is 300.

if you meant x + y...

15 + 20 is 35.

if you meant anything else, please let me know

the way it was written confused me but I tried.

7 0
2 years ago
(2x2 3+2)x(4x2 3-1/2)
Travka [436]

Answer:

85.5

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Linear system word problem
jeka57 [31]
Drinks, x, and popcorn, y.
38.75 = 5x+2y
37.25 = 3x + 4y
Let's solve this using the elimination method
subtract the 2nd row from the first
<span>7x=40.2<span>5
divide both sides by 7 to isolate x
</span></span><span>x=5.7<span>5

Substitute x into an equation
</span></span><span><span>10(5.75)+4y=77.5
multiply
</span></span>57.5+4y=77.<span>5
subtract 57.5 from both sides
</span>4y=77.5−57.<span>5
Simplify
</span>4y=2<span>0
divide both sides by 4 to isolate y
y = 5

To check you would plug x and y into the equations and see if it equals properly...

The price of drinks is $5.75, the price of popcorn is $5.

Hope this helps 
</span>
3 0
2 years ago
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