First equation x-y=8 second equation x+y=6 this would be very helpful

Mathematics

1 answer:

skelet666 [1.2K]2 years ago

4 0

I’m sorry I don’t know

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Plzzz Help ASAP! This image shows a square pyramid what is the surface area of this square pyramid?

padilas [110]

Answer:

$72\ ft^{2}$

Step-by-step explanation:

we know that

The surface area of the square pyramid is equal to the area of the square base plus the area of its four lateral triangular faces

$SA=b^{2}+4[\frac{1}{2}bh]$

where

b is the length side of the square base

h is the height of the triangular face

Remember that

Each lateral triangular face is a triangle 45°-90°-45°

$h=b/2$

we have

$b=6\ ft$

$h=6/2=3\ ft$

substitute in the formula

$SA=6^{2}+4[\frac{1}{2}(6)(3)]=72\ ft^{2}$

7 0

2 years ago

A high school teacher gives three regular exams during a semester and one final exam at the end of the semester. A student’s fin

statuscvo [17]

To get an average score of 80% (out of four exams), a total of 4*80%=320% is needed, so the minimum required for the 4th test is 320-(75+97+60)=88.
To get an average score of 89% (out of four exams), a total of 4*89%=356% is needed, so the maximum required for the 4th test is 356-(75+97+60)=124, which is impossible.
So the next exam grade must range between 88 and 100 to get a grade b in the class.

Hoped I help! Mark brainly it would help<3

5 0

2 years ago

The ratio of customers who purchase items with coupons to customers who don't use coupons is 6 to 16. If 9 customers use coupons

Irina-Kira [14]

Answer:

24 customers will not use coupons.

Step-by-step explanation:

Number of customers who use coupons = 9

Number of customers who don't use coupons = x

Ratio of customers who use coupons to customers who don't use coupons = 6:16

$=\frac{6}{16}$